chore: add internal docs directory to .gitignore

Co-authored-by: Cursor <cursoragent@cursor.com>

.gitignore

@@ -0,0 +1,9 @@
+.pio/
+.superpowers/
+docs/superpowers/
+
+.cursor/
+chat-summaries/
+wake_*.csv
+
+.DS_Store

data/app.js

@@ -0,0 +1,333 @@
+const API = '';
+let currentPage = 'dashboard';
+
+async function api(path, opts = {}) {
+    const res = await fetch(API + path, {
+        headers: { 'Content-Type': 'application/json' },
+        ...opts
+    });
+    return res.json();
+}
+
+function toast(msg) {
+    let t = document.querySelector('.toast');
+    if (!t) { t = document.createElement('div'); t.className = 'toast'; document.body.appendChild(t); }
+    t.textContent = msg;
+    t.classList.add('show');
+    setTimeout(() => t.classList.remove('show'), 3000);
+}
+
+function navigate(page) {
+    currentPage = page;
+    document.querySelectorAll('#nav-links a').forEach(a => {
+        a.classList.toggle('active', a.dataset.page === page);
+    });
+    renderPage(page);
+}
+
+async function renderPage(page) {
+    const el = document.getElementById('content');
+    switch (page) {
+        case 'dashboard': return renderDashboard(el);
+        case 'albums': return renderAlbums(el);
+        case 'slideshow': return renderSlideshow(el);
+        case 'display': return renderDisplay(el);
+        case 'device': return renderDevice(el);
+        case 'firmware': return renderFirmware(el);
+    }
+}
+
+async function renderDashboard(el) {
+    const status = await api('/api/status');
+    el.innerHTML = `
+        <div class="card">
+            <h2>Status</h2>
+            <div class="stat"><span>Battery</span><span>${status.battery}%${status.charging ? ' ⚡' : ''}</span></div>
+            <div class="stat"><span>WiFi Signal</span><span>${status.wifi_rssi} dBm</span></div>
+            <div class="stat"><span>IP Address</span><span>${status.ip}</span></div>
+            <div class="stat"><span>Uptime</span><span>${Math.floor(status.uptime/60)}m</span></div>
+            <div class="stat"><span>Free RAM</span><span>${Math.floor(status.free_heap/1024)}KB</span></div>
+            <div class="stat"><span>Free PSRAM</span><span>${Math.floor(status.free_psram/1024)}KB</span></div>
+        </div>
+        <div class="card">
+            <h2>Controls</h2>
+            <div class="btn-group">
+                <button class="btn btn-primary" onclick="api('/api/action/next',{method:'POST'}).then(()=>toast('Next photo'))">Next</button>
+                <button class="btn btn-primary" onclick="api('/api/action/random',{method:'POST'}).then(()=>toast('Random photo'))">Random</button>
+                <button class="btn btn-primary" onclick="api('/api/action/pause',{method:'POST'}).then(()=>toast('Paused'))">Pause</button>
+                <button class="btn btn-primary" onclick="api('/api/action/play',{method:'POST'}).then(()=>toast('Playing'))">Play</button>
+            </div>
+        </div>`;
+}
+
+async function renderAlbums(el) {
+    const [albums, settings] = await Promise.all([api('/api/albums'), api('/api/settings')]);
+    const selected = JSON.parse(settings.albums_json || '[]');
+    el.innerHTML = `
+        <div class="card">
+            <h2>Albums</h2>
+            <ul class="checkbox-list">
+                ${albums.map(a => `
+                    <li>
+                        <input type="checkbox" value="${a.id}" ${selected.includes(a.id) ? 'checked' : ''}>
+                        <span>${a.title} (${a.assetCount})</span>
+                    </li>`).join('')}
+            </ul>
+            <div class="btn-group">
+                <button class="btn btn-primary" id="saveAlbums">Save Selection</button>
+            </div>
+        </div>`;
+    document.getElementById('saveAlbums').onclick = async () => {
+        const ids = [...el.querySelectorAll('input[type=checkbox]:checked')].map(c => c.value);
+        await api('/api/albums/select', { method: 'POST', body: JSON.stringify({ album_ids: ids }) });
+        toast('Albums saved');
+    };
+}
+
+async function renderSlideshow(el) {
+    const settings = await api('/api/settings');
+    const presets = [1, 2, 5, 10, 15, 30, 60];
+    const isCustom = !presets.includes(settings.interval_min);
+    const modes = ['Random', 'Chronological', 'Reverse Chrono', 'Favorites Weighted',
+                   'Weighted Recent', 'Weighted Oldest'];
+    el.innerHTML = `
+        <div class="card">
+            <h2>Interval</h2>
+            <div class="preset-btns">
+                ${presets.map(i => `<button class="${!isCustom && settings.interval_min===i?'active':''}" data-interval="${i}">${i}m</button>`).join('')}
+                <button class="${isCustom?'active':''}" data-interval="custom">Custom</button>
+            </div>
+            <div class="field" id="customIntervalRow" style="margin-top:8px;display:${isCustom?'flex':'none'}">
+                <label>Minutes (1–60):</label>
+                <input type="number" id="customInterval" min="1" max="60" value="${isCustom?settings.interval_min:5}" style="width:60px;margin-left:8px">
+            </div>
+        </div>
+        <div class="card">
+            <h2>Cycling Mode</h2>
+            <div class="field">
+                <select id="cycleMode">
+                    ${modes.map((m, i) => `<option value="${i}" ${settings.cycle_mode===i?'selected':''}>${m}</option>`).join('')}
+                </select>
+            </div>
+        </div>
+        <div class="card">
+            <h2>Deep Sleep Batch Size</h2>
+            <p style="opacity:0.7;font-size:13px;margin-bottom:8px">Photos to pre-fetch per API call in deep sleep mode. Higher = fewer network calls, better battery life.</p>
+            <div class="field">
+                <input type="number" id="timerBatch" min="1" max="50" value="${settings.timer_batch_size || 10}" style="width:80px">
+            </div>
+        </div>
+        <div class="btn-group"><button class="btn btn-primary" id="saveSlideshow">Save</button></div>`;
+    el.querySelectorAll('[data-interval]').forEach(btn => {
+        btn.onclick = () => {
+            el.querySelectorAll('[data-interval]').forEach(b => b.classList.remove('active'));
+            btn.classList.add('active');
+            document.getElementById('customIntervalRow').style.display =
+                btn.dataset.interval === 'custom' ? 'flex' : 'none';
+        };
+    });
+    document.getElementById('saveSlideshow').onclick = async () => {
+        const activeBtn = el.querySelector('[data-interval].active');
+        let interval;
+        if (activeBtn && activeBtn.dataset.interval === 'custom') {
+            interval = Math.min(60, Math.max(1, parseInt(document.getElementById('customInterval').value) || 5));
+        } else {
+            interval = parseInt(activeBtn?.dataset.interval || '5');
+        }
+        const mode = parseInt(document.getElementById('cycleMode').value);
+        const batch = Math.min(50, Math.max(1, parseInt(document.getElementById('timerBatch').value) || 10));
+        await api('/api/settings', { method: 'POST', body: JSON.stringify({ interval_min: interval, cycle_mode: mode, timer_batch_size: batch }) });
+        toast('Slideshow settings saved');
+    };
+}
+
+async function renderDisplay(el) {
+    const settings = await api('/api/settings');
+    const flags = settings.meta_flags;
+    el.innerHTML = `
+        <div class="card">
+            <h2>Image Quality</h2>
+            <div class="field">
+                <select id="imgQuality">
+                    <option value="0" ${settings.img_quality===0?'selected':''}>Preview (faster)</option>
+                    <option value="1" ${settings.img_quality===1?'selected':''}>Original (higher quality)</option>
+                </select>
+            </div>
+        </div>
+        <div class="card">
+            <h2>Image Processing</h2>
+            <div class="field">
+                <select id="pipelineMode">
+                    <option value="0" ${settings.pipeline_mode===0?'selected':''}>Dynamic (vivid colors)</option>
+                    <option value="1" ${settings.pipeline_mode===1?'selected':''}>Balanced (preserve tones)</option>
+                    <option value="2" ${settings.pipeline_mode===2?'selected':''}>None (no processing)</option>
+                </select>
+            </div>
+        </div>
+        <div class="card">
+            <h2>Metadata Overlay</h2>
+            <ul class="checkbox-list">
+                <li><input type="checkbox" data-flag="1" ${flags&1?'checked':''}><span>Date</span></li>
+                <li><input type="checkbox" data-flag="32" ${flags&32?'checked':''}><span>Time</span></li>
+                <li><input type="checkbox" data-flag="2" ${flags&2?'checked':''}><span>Location</span></li>
+                <li><input type="checkbox" data-flag="4" ${flags&4?'checked':''}><span>People</span></li>
+                <li><input type="checkbox" data-flag="8" ${flags&8?'checked':''}><span>Album</span></li>
+                <li><input type="checkbox" data-flag="16" ${flags&16?'checked':''}><span>Camera</span></li>
+            </ul>
+            <div class="field">
+                <label>Date Format</label>
+                <input type="text" id="dateFmt" value="${settings.date_fmt || '%Y-%m-%d'}" placeholder="%Y-%m-%d">
+                <small>strftime: %Y=year %m=month %d=day %b=Mon %B=Month</small>
+            </div>
+            <div class="field">
+                <label>Time Format</label>
+                <input type="text" id="timeFmt" value="${settings.time_fmt || '%H:%M:%S'}" placeholder="%H:%M:%S">
+                <small>strftime: %H=24h %I=12h %M=min %S=sec %p=AM/PM</small>
+            </div>
+            <div class="field">
+                <label>Style &amp; Position</label>
+                <select id="metaPos">
+                    <option value="0" ${settings.meta_pos===0?'selected':''}>Caption - Bottom</option>
+                    <option value="1" ${settings.meta_pos===1?'selected':''}>Caption - Top</option>
+                    <option value="2" ${settings.meta_pos===2?'selected':''}>Overlay - Top Left</option>
+                    <option value="3" ${settings.meta_pos===3?'selected':''}>Overlay - Top Right</option>
+                    <option value="4" ${settings.meta_pos===4?'selected':''}>Overlay - Bottom Left</option>
+                    <option value="5" ${settings.meta_pos===5?'selected':''}>Overlay - Bottom Right</option>
+                </select>
+            </div>
+            <ul class="checkbox-list">
+                <li><input type="checkbox" id="metaTranslucent" ${settings.meta_translucent?'checked':''}><span>Translucent background?</span></li>
+            </ul>
+        </div>
+        <div class="card">
+            <h2>Battery Indicator</h2>
+            <ul class="checkbox-list">
+                <li><input type="checkbox" id="showBattery" ${settings.show_battery?'checked':''}><span>Show battery level on display</span></li>
+            </ul>
+        </div>
+        <div class="btn-group"><button class="btn btn-primary" id="saveDisplay">Save</button></div>`;
+    document.getElementById('saveDisplay').onclick = async () => {
+        let flags = 0;
+        el.querySelectorAll('[data-flag]').forEach(cb => { if (cb.checked) flags |= parseInt(cb.dataset.flag); });
+        await api('/api/settings', { method: 'POST', body: JSON.stringify({
+            img_quality: parseInt(document.getElementById('imgQuality').value),
+            pipeline_mode: parseInt(document.getElementById('pipelineMode').value),
+            meta_flags: flags,
+            meta_pos: parseInt(document.getElementById('metaPos').value),
+            meta_translucent: document.getElementById('metaTranslucent').checked ? 1 : 0,
+            date_fmt: document.getElementById('dateFmt').value,
+            time_fmt: document.getElementById('timeFmt').value,
+            show_battery: document.getElementById('showBattery').checked ? 1 : 0
+        })});
+        toast('Display settings saved');
+    };
+}
+
+async function renderDevice(el) {
+    const settings = await api('/api/settings');
+    el.innerHTML = `
+        <div class="card">
+            <h2>Immich Connection</h2>
+            <div class="field">
+                <label>Immich URL</label>
+                <input type="url" id="immichUrl" value="${settings.immich_url || ''}" placeholder="https://photos.example.com">
+            </div>
+            <div class="field">
+                <label>API Key</label>
+                <input type="password" id="immichKey" value="${settings.immich_key || ''}" placeholder="Your Immich API key">
+            </div>
+            <div class="btn-group">
+                <button class="btn btn-primary" id="saveImmich">Save</button>
+                <button class="btn" id="testConn">Test Connection</button>
+            </div>
+            <div id="connStatus" style="margin-top:12px"></div>
+        </div>
+        <div class="card">
+            <h2>Device Actions</h2>
+            <div class="btn-group">
+                <button class="btn" id="syncTime">Sync Time</button>
+                <button class="btn btn-danger" onclick="if(confirm('Enter deep sleep?'))api('/api/action/sleep',{method:'POST'})">Deep Sleep</button>
+                <button class="btn btn-danger" onclick="if(confirm('Reboot device?'))fetch('/api/action/reboot',{method:'POST'})">Reboot</button>
+            </div>
+        </div>
+        <div class="card">
+            <h2>Wake Log</h2>
+            <p style="opacity:0.7;margin-bottom:8px">Persistent CSV log of each photo cycle (survives reboots/sleep).</p>
+            <div class="btn-group">
+                <button class="btn btn-primary" id="downloadLog">Download Log</button>
+                <button class="btn btn-danger" id="clearLog">Clear Log</button>
+            </div>
+        </div>`;
+
+    document.getElementById('saveImmich').onclick = async () => {
+        const url = document.getElementById('immichUrl').value.trim();
+        const key = document.getElementById('immichKey').value.trim();
+        if (!url || !key) return toast('URL and API key are required');
+        await api('/api/settings', { method: 'POST', body: JSON.stringify({ immich_url: url, immich_key: key }) });
+        toast('Immich settings saved. Reboot to apply.');
+    };
+
+    document.getElementById('testConn').onclick = async () => {
+        const status = document.getElementById('connStatus');
+        status.textContent = 'Testing...';
+        status.style.color = '';
+        try {
+            const result = await api('/api/test-connection', { method: 'POST' });
+            status.textContent = result.msg;
+            status.style.color = result.ok ? '#2e7d32' : '#c62828';
+        } catch (e) {
+            status.textContent = 'Request failed: ' + e.message;
+            status.style.color = '#c62828';
+        }
+    };
+
+    document.getElementById('syncTime').onclick = async () => {
+        toast('Syncing...');
+        const result = await api('/api/action/sync-time', { method: 'POST' });
+        toast(result.msg || 'Time synced');
+    };
+
+    document.getElementById('downloadLog').onclick = () => {
+        const a = document.createElement('a');
+        a.href = '/api/log';
+        a.download = 'wake_log.csv';
+        a.click();
+    };
+
+    document.getElementById('clearLog').onclick = async () => {
+        if (!confirm('Clear the wake log?')) return;
+        const result = await api('/api/log/clear', { method: 'POST' });
+        toast(result.msg || 'Log cleared');
+    };
+}
+
+async function renderFirmware(el) {
+    el.innerHTML = `
+        <div class="card">
+            <h2>Firmware Update</h2>
+            <div class="field">
+                <label>Upload .bin file</label>
+                <input type="file" id="fwFile" accept=".bin">
+            </div>
+            <button class="btn btn-primary" id="uploadFw">Upload & Flash</button>
+            <div id="fwStatus" style="margin-top:12px"></div>
+        </div>`;
+    document.getElementById('uploadFw').onclick = async () => {
+        const file = document.getElementById('fwFile').files[0];
+        if (!file) return toast('Select a file first');
+        const formData = new FormData();
+        formData.append('firmware', file);
+        document.getElementById('fwStatus').textContent = 'Uploading...';
+        const res = await fetch('/api/firmware', { method: 'POST', body: formData });
+        const data = await res.json();
+        document.getElementById('fwStatus').textContent = data.msg || (data.ok ? 'Success!' : 'Failed');
+    };
+}
+
+// Navigation
+document.querySelectorAll('#nav-links a').forEach(a => {
+    a.addEventListener('click', (e) => { e.preventDefault(); navigate(a.dataset.page); });
+});
+
+// Initial render
+navigate('dashboard');

data/index.html

@@ -0,0 +1,24 @@
+<!DOCTYPE html>
+<html lang="en">
+<head>
+    <meta charset="UTF-8">
+    <meta name="viewport" content="width=device-width, initial-scale=1.0">
+    <title>PaperColor</title>
+    <link rel="stylesheet" href="/style.css">
+</head>
+<body>
+    <nav>
+        <h1>PaperColor</h1>
+        <div id="nav-links">
+            <a href="#" data-page="dashboard" class="active">Dashboard</a>
+            <a href="#" data-page="albums">Albums</a>
+            <a href="#" data-page="slideshow">Slideshow</a>
+            <a href="#" data-page="display">Display</a>
+            <a href="#" data-page="device">Device</a>
+            <a href="#" data-page="firmware">Firmware</a>
+        </div>
+    </nav>
+    <main id="content"></main>
+    <script src="/app.js"></script>
+</body>
+</html>

data/setup.html

@@ -0,0 +1,100 @@
+<!DOCTYPE html>
+<html lang="en">
+<head>
+    <meta charset="UTF-8">
+    <meta name="viewport" content="width=device-width, initial-scale=1.0">
+    <title>PaperColor Setup</title>
+    <style>
+        * { box-sizing: border-box; margin: 0; padding: 0; }
+        body { font-family: -apple-system, sans-serif; max-width: 400px; margin: 40px auto; padding: 20px; background: #f5f5f5; }
+        h1 { margin-bottom: 20px; color: #333; }
+        .field { margin-bottom: 16px; }
+        label { display: block; font-weight: 600; margin-bottom: 4px; color: #555; }
+        input, select { width: 100%; padding: 10px; border: 1px solid #ddd; border-radius: 6px; font-size: 16px; }
+        button { width: 100%; padding: 12px; background: #2563eb; color: white; border: none; border-radius: 6px; font-size: 16px; cursor: pointer; margin-top: 10px; }
+        button:hover { background: #1d4ed8; }
+        .status { margin-top: 16px; padding: 10px; border-radius: 6px; display: none; }
+        .status.error { display: block; background: #fee2e2; color: #991b1b; }
+        .status.success { display: block; background: #d1fae5; color: #065f46; }
+        #networks { margin-bottom: 16px; }
+    </style>
+</head>
+<body>
+    <h1>PaperColor Setup</h1>
+    <form id="setupForm">
+        <div class="field">
+            <label>WiFi Network</label>
+            <select id="wifiSsid"><option value="">Scanning...</option></select>
+        </div>
+        <div class="field">
+            <label>WiFi Password</label>
+            <input type="password" id="wifiPass" required>
+        </div>
+        <div class="field">
+            <label>Immich URL</label>
+            <input type="url" id="immichUrl" value="https://photos.example.com">
+        </div>
+        <div class="field">
+            <label>Immich API Key</label>
+            <input type="text" id="immichKey" required placeholder="Your API key">
+        </div>
+        <button type="submit">Save & Connect</button>
+    </form>
+    <div id="status" class="status"></div>
+
+    <script>
+        async function scanNetworks() {
+            try {
+                const res = await fetch('/api/wifi/scan');
+                const data = await res.json();
+                if (data.scanning) {
+                    // Scan in progress — retry after 2s
+                    setTimeout(scanNetworks, 2000);
+                    return;
+                }
+                const select = document.getElementById('wifiSsid');
+                if (data.length === 0) {
+                    select.innerHTML = '<option value="">No networks found</option>';
+                    setTimeout(scanNetworks, 3000);
+                    return;
+                }
+                select.innerHTML = data.map(n =>
+                    `<option value="${n.ssid}">${n.ssid} (${n.rssi}dBm)</option>`
+                ).join('');
+            } catch (e) {
+                console.error('Scan failed:', e);
+                setTimeout(scanNetworks, 3000);
+            }
+        }
+
+        document.getElementById('setupForm').addEventListener('submit', async (e) => {
+            e.preventDefault();
+            const status = document.getElementById('status');
+            try {
+                const res = await fetch('/api/setup', {
+                    method: 'POST',
+                    headers: { 'Content-Type': 'application/json' },
+                    body: JSON.stringify({
+                        wifi_ssid: document.getElementById('wifiSsid').value,
+                        wifi_pass: document.getElementById('wifiPass').value,
+                        immich_url: document.getElementById('immichUrl').value,
+                        immich_key: document.getElementById('immichKey').value
+                    })
+                });
+                const data = await res.json();
+                if (data.ok) {
+                    status.className = 'status success';
+                    status.textContent = 'Saved! Device is rebooting...';
+                } else {
+                    throw new Error(data.error || 'Unknown error');
+                }
+            } catch (e) {
+                status.className = 'status error';
+                status.textContent = 'Error: ' + e.message;
+            }
+        });
+
+        scanNetworks();
+    </script>
+</body>
+</html>

data/style.css

@@ -0,0 +1,29 @@
+* { box-sizing: border-box; margin: 0; padding: 0; }
+body { font-family: -apple-system, BlinkMacSystemFont, sans-serif; background: #f8fafc; color: #1e293b; }
+nav { background: #1e293b; color: white; padding: 16px 24px; display: flex; align-items: center; gap: 24px; flex-wrap: wrap; }
+nav h1 { font-size: 18px; white-space: nowrap; }
+#nav-links { display: flex; gap: 12px; flex-wrap: wrap; }
+#nav-links a { color: #94a3b8; text-decoration: none; padding: 4px 8px; border-radius: 4px; font-size: 14px; }
+#nav-links a.active { color: white; background: #334155; }
+main { max-width: 800px; margin: 24px auto; padding: 0 16px; }
+.card { background: white; border-radius: 8px; padding: 20px; margin-bottom: 16px; box-shadow: 0 1px 3px rgba(0,0,0,0.1); }
+.card h2 { font-size: 16px; margin-bottom: 12px; color: #475569; }
+.stat { display: flex; justify-content: space-between; padding: 8px 0; border-bottom: 1px solid #f1f5f9; }
+.stat:last-child { border-bottom: none; }
+.field { margin-bottom: 16px; }
+.field label { display: block; font-weight: 600; margin-bottom: 4px; font-size: 14px; color: #64748b; }
+.field input, .field select { width: 100%; padding: 8px 12px; border: 1px solid #e2e8f0; border-radius: 6px; font-size: 14px; }
+.btn { padding: 8px 16px; border: none; border-radius: 6px; font-size: 14px; cursor: pointer; }
+.btn-primary { background: #2563eb; color: white; }
+.btn-primary:hover { background: #1d4ed8; }
+.btn-danger { background: #dc2626; color: white; }
+.btn-danger:hover { background: #b91c1c; }
+.btn-group { display: flex; gap: 8px; margin-top: 12px; }
+.checkbox-list { list-style: none; }
+.checkbox-list li { padding: 8px 0; border-bottom: 1px solid #f1f5f9; display: flex; align-items: center; gap: 8px; }
+.checkbox-list input[type="checkbox"] { width: 18px; height: 18px; }
+.preset-btns { display: flex; gap: 8px; flex-wrap: wrap; }
+.preset-btns button { padding: 6px 12px; border: 1px solid #e2e8f0; border-radius: 4px; background: white; cursor: pointer; }
+.preset-btns button.active { background: #2563eb; color: white; border-color: #2563eb; }
+.toast { position: fixed; bottom: 20px; right: 20px; background: #065f46; color: white; padding: 12px 20px; border-radius: 6px; display: none; }
+.toast.show { display: block; }

partitions_custom.csv

@@ -3,5 +3,5 @@ nvs,        data, nvs,      0x9000,    0x5000,
 otadata,    data, ota,      0xe000,    0x2000,
 app0,       app,  ota_0,    0x10000,   0x680000,
 app1,       app,  ota_1,    0x690000,  0x680000,
-littlefs,   data, spiffs,   0xD10000,  0x80000,
+spiffs,     data, spiffs,   0xD10000,  0x80000,
 coredump,   data, coredump, 0xD90000,  0x10000,

platformio.ini

@@ -16,12 +16,14 @@ build_flags =
     -DCORE_DEBUG_LEVEL=3
     -DARDUINO_USB_CDC_ON_BOOT=1
     -DARDUINO_USB_MODE=1
+    -DARDUINO_LOOP_STACK_SIZE=32768
 lib_deps =
     m5stack/M5Unified @ ^0.2.2
     m5stack/M5GFX @ ^0.2.5
     https://github.com/m5stack/M5PM1.git
     mathieucarbou/ESP Async WebServer @ ^3.0.6
     bblanchon/ArduinoJson @ ^7.0.0
+    ricmoo/QRCode @ ^0.0.1
 lib_ignore =
     WebServer
 

src/blue_noise.h

@@ -0,0 +1,83 @@
+#pragma once
+
+#ifdef ARDUINO
+#include <Arduino.h>
+#else
+#ifndef PROGMEM
+#define PROGMEM
+#endif
+#ifndef pgm_read_byte
+#define pgm_read_byte(addr) (*(const uint8_t*)(addr))
+#endif
+#include <cstdint>
+#endif
+
+// 64x64 blue noise texture generated via void-and-cluster algorithm.
+// Used for dither threshold modulation to break up Floyd-Steinberg patterns.
+// Values 0-255, spatially uniform frequency distribution.
+static const uint8_t PROGMEM BLUE_NOISE_64[64 * 64] = {
+    0x8A, 0xF1, 0x42, 0xE3, 0x6C, 0x4E, 0xBA, 0xF1, 0x47, 0xCA, 0xB7, 0x32, 0x8C, 0x69, 0x09, 0xB0, 0x89, 0x0E, 0xF5, 0x21, 0x30, 0xC7, 0x6E, 0x10, 0xEA, 0xBC, 0x08, 0x9E, 0xF0, 0x29, 0x6B, 0xC6, 0x51, 0x16, 0xB5, 0x5B, 0x44, 0xA7, 0x68, 0x8D, 0x4E, 0xBF, 0x95, 0x10, 0x18, 0xEA, 0x8A, 0xD6, 0x27, 0x38, 0x93, 0xC9, 0x14, 0x8D, 0xF0, 0xB7, 0xD1, 0x53, 0x22, 0xDD, 0xC8, 0xA2, 0x61, 0xB4,
+    0x0A, 0x9E, 0x26, 0x84, 0x9B, 0xD0, 0x16, 0x88, 0x9A, 0x0B, 0x59, 0xD9, 0x20, 0xEE, 0x4E, 0xCC, 0x73, 0xD6, 0x54, 0xBE, 0x9B, 0xED, 0x41, 0xA2, 0x56, 0x7E, 0xDD, 0x34, 0x61, 0x13, 0xD7, 0x7F, 0x05, 0xED, 0x94, 0x0D, 0x7D, 0xCB, 0x3B, 0xE8, 0xB0, 0x20, 0xE5, 0x85, 0xCC, 0x01, 0x3D, 0x5D, 0xAD, 0xE2, 0x4F, 0xF6, 0xA9, 0x2F, 0x4C, 0x65, 0x17, 0x85, 0xB1, 0x32, 0x5A, 0x1D, 0x7D, 0xDF,
+    0x6D, 0xD1, 0x5E, 0xB8, 0x0C, 0xFD, 0x64, 0x34, 0xE5, 0x6D, 0xAA, 0x3C, 0x7D, 0xB8, 0x98, 0x38, 0x13, 0xA9, 0x3C, 0x80, 0x60, 0x17, 0x78, 0xD1, 0x2E, 0xAE, 0x4B, 0x73, 0xC2, 0x96, 0x39, 0xA0, 0xB9, 0x62, 0xD3, 0x33, 0xF1, 0x99, 0x0A, 0x73, 0x2D, 0x62, 0x46, 0x6C, 0xB1, 0x56, 0xA1, 0xFB, 0x6E, 0x0B, 0x7D, 0x18, 0x69, 0xDD, 0x81, 0xA4, 0x0E, 0xEC, 0x6C, 0x99, 0xF5, 0xB9, 0x2C, 0x48,
+    0xC5, 0x35, 0xED, 0x4B, 0x19, 0x7F, 0x44, 0xB5, 0xD3, 0x27, 0xF8, 0x92, 0x62, 0x15, 0xDE, 0x5E, 0xFA, 0x8F, 0xE7, 0x0D, 0xDB, 0xAB, 0x04, 0xFA, 0x93, 0x1A, 0xEC, 0x8C, 0x01, 0xFE, 0x56, 0xE3, 0x27, 0x41, 0x72, 0xB1, 0x54, 0x18, 0xBB, 0xD9, 0x9E, 0xEF, 0xC3, 0x33, 0xF4, 0x7C, 0x2B, 0xC2, 0x15, 0xD2, 0x9A, 0xBA, 0x43, 0xC5, 0x24, 0xE6, 0xBC, 0x47, 0xD5, 0x14, 0x41, 0x8B, 0xE7, 0xA8,
+    0x17, 0x8D, 0x77, 0xAA, 0xE0, 0xC4, 0x98, 0x12, 0x79, 0x50, 0x06, 0xC0, 0xE9, 0x48, 0x01, 0xC1, 0x6D, 0x23, 0x4D, 0xBA, 0x36, 0x87, 0xC5, 0x44, 0x61, 0xBD, 0x27, 0xCF, 0x42, 0xB0, 0x77, 0x1C, 0x8A, 0xF4, 0x9E, 0x14, 0xDF, 0x6B, 0x8A, 0x44, 0x12, 0x7E, 0x06, 0x9A, 0x1F, 0xDB, 0x48, 0x94, 0x83, 0x3A, 0x57, 0xEB, 0x04, 0x90, 0x5C, 0x38, 0x71, 0x8F, 0x01, 0x61, 0xC9, 0x6E, 0x0C, 0x5B,
+    0xF6, 0x02, 0xD9, 0x2C, 0x69, 0x07, 0xE9, 0x60, 0xA4, 0xC7, 0x85, 0x30, 0x9F, 0x77, 0xAA, 0x88, 0x2E, 0xCD, 0x9C, 0x70, 0xF5, 0x57, 0x28, 0x73, 0xDF, 0x83, 0x56, 0xA3, 0x6A, 0x2C, 0xDB, 0xC3, 0x4D, 0xCC, 0x08, 0x81, 0xC0, 0x34, 0xFC, 0x5C, 0xCB, 0xAF, 0x4E, 0xD4, 0x60, 0xB8, 0x08, 0xED, 0x61, 0xE3, 0xA5, 0x2E, 0x71, 0xFE, 0x9E, 0xD0, 0x20, 0xF7, 0xB3, 0x9D, 0xEF, 0x37, 0xBB, 0x98,
+    0x4A, 0xB5, 0x59, 0x9B, 0x3F, 0x86, 0x4D, 0x28, 0xF4, 0x39, 0xDF, 0x5C, 0x1D, 0xD4, 0x3A, 0xF2, 0x58, 0xE5, 0x09, 0xAF, 0x1E, 0x94, 0xE9, 0xA7, 0x0D, 0x39, 0xF7, 0x1D, 0xE3, 0x91, 0x0D, 0xA0, 0x6E, 0x2F, 0x5C, 0xEB, 0x49, 0xA4, 0x1F, 0x92, 0x2A, 0xF4, 0x73, 0x8E, 0x38, 0xA2, 0x75, 0xC8, 0x17, 0xB3, 0x1F, 0x8A, 0xCC, 0x47, 0x0F, 0xAE, 0x57, 0x7F, 0x2E, 0x4D, 0x7C, 0x22, 0xDE, 0x75,
+    0xD6, 0x83, 0x21, 0xC7, 0xF7, 0xA6, 0xD2, 0xBA, 0x8E, 0x0E, 0x72, 0xB0, 0xFE, 0x53, 0xB9, 0x0F, 0x98, 0x79, 0x38, 0x60, 0xD1, 0x48, 0xBE, 0x17, 0xD3, 0x9A, 0xB3, 0x79, 0x4A, 0xBE, 0x60, 0x3C, 0xF9, 0xB7, 0x94, 0xD5, 0x1A, 0x71, 0xDA, 0xBF, 0x68, 0x3E, 0x0D, 0xE3, 0x22, 0xFD, 0x52, 0x10, 0x45, 0x7B, 0xD7, 0x51, 0xAC, 0x15, 0x85, 0xE5, 0x3C, 0xDA, 0xBD, 0x1A, 0xCF, 0xA4, 0x43, 0x0F,
+    0xA9, 0x38, 0xEB, 0x6D, 0x10, 0x30, 0x76, 0x1E, 0x63, 0xD5, 0x49, 0x96, 0x27, 0x86, 0x6F, 0x18, 0xCA, 0x47, 0xBF, 0xF0, 0x7F, 0x30, 0x6C, 0x8B, 0x51, 0x68, 0x04, 0xC8, 0x34, 0xED, 0x87, 0xAE, 0x02, 0x79, 0x25, 0x3C, 0xAB, 0x87, 0x4F, 0x00, 0xAA, 0xDD, 0x99, 0xC4, 0x67, 0x84, 0xAC, 0xDF, 0x98, 0xF8, 0x68, 0x36, 0xEA, 0x61, 0xBE, 0x73, 0x07, 0x91, 0x66, 0xEC, 0x5B, 0x8C, 0xFC, 0x65,
+    0x13, 0xBE, 0x91, 0x47, 0xB1, 0x5A, 0xE3, 0x9F, 0x3E, 0xB6, 0xEB, 0x08, 0xC4, 0x3D, 0xEE, 0xA8, 0xDF, 0x8A, 0x14, 0xA5, 0x03, 0x9C, 0xFD, 0x0F, 0xE1, 0x41, 0xF2, 0x93, 0x5C, 0x12, 0x28, 0xE1, 0x4E, 0xCF, 0xED, 0x69, 0xBB, 0xE4, 0x37, 0xF0, 0x7B, 0x58, 0x29, 0x4C, 0xB4, 0x1A, 0x2F, 0x64, 0xC1, 0x26, 0x00, 0xB8, 0x90, 0x2A, 0xF2, 0x4F, 0xC9, 0x25, 0xA3, 0x3E, 0x05, 0xB6, 0x29, 0x7F,
+    0xD0, 0x55, 0x08, 0xDD, 0x80, 0xCA, 0x00, 0xFB, 0x87, 0x2A, 0x7E, 0x6B, 0xE1, 0x9F, 0x60, 0x06, 0x54, 0x2F, 0x6E, 0xE3, 0x42, 0xD7, 0x58, 0xAB, 0xC0, 0x81, 0x2A, 0xD7, 0xAB, 0x76, 0xC6, 0x64, 0x9A, 0x1C, 0x8B, 0x52, 0x0A, 0x28, 0x65, 0xA0, 0x11, 0xD1, 0x8B, 0xF1, 0x3B, 0xE7, 0xD1, 0x90, 0x3F, 0x82, 0xA1, 0xD4, 0x6E, 0x0B, 0x9B, 0x32, 0xAB, 0xFA, 0x81, 0xE0, 0x73, 0xCB, 0x4F, 0xE8,
+    0x9D, 0x76, 0xF9, 0x27, 0x97, 0x39, 0x6F, 0x51, 0xC2, 0x1A, 0xAA, 0x35, 0x4F, 0x1D, 0xD6, 0x7D, 0xB6, 0xFA, 0x93, 0x5B, 0xB5, 0x26, 0x75, 0x37, 0x1F, 0xA0, 0x6D, 0x10, 0x3F, 0xFC, 0x92, 0x32, 0xB2, 0x43, 0xC5, 0xA2, 0xF8, 0xCC, 0x91, 0xC2, 0x42, 0xB0, 0x17, 0x69, 0x9A, 0x7B, 0x56, 0x09, 0xF4, 0x5A, 0xE2, 0x38, 0x4E, 0xCC, 0x80, 0xDD, 0x60, 0x12, 0x4D, 0x31, 0xA7, 0x1E, 0x8F, 0x36,
+    0x1B, 0xB5, 0x41, 0x66, 0xD7, 0xBC, 0x22, 0x9C, 0xD8, 0x61, 0xF3, 0xCB, 0x8B, 0xBA, 0x2C, 0x97, 0x40, 0x15, 0xCF, 0x0B, 0x83, 0xC6, 0x96, 0xF1, 0xCC, 0x56, 0xEB, 0x8B, 0xBB, 0x51, 0x0A, 0xD9, 0xF2, 0x6B, 0x29, 0x75, 0x39, 0x7E, 0x55, 0x19, 0xFC, 0x71, 0xDD, 0x08, 0xBF, 0x23, 0xA6, 0xC9, 0x14, 0xB1, 0x77, 0x1B, 0xFC, 0xA5, 0x1F, 0x3F, 0x78, 0xC5, 0x97, 0xD0, 0x5E, 0xF5, 0xBB, 0x6B,
+    0x2A, 0xE9, 0x88, 0xA9, 0x19, 0x4D, 0xF0, 0x7C, 0x31, 0x46, 0x94, 0x05, 0x5C, 0xF9, 0x71, 0xE3, 0xC2, 0x65, 0xA8, 0x3B, 0xF5, 0x4E, 0x0E, 0x67, 0x43, 0x01, 0xA8, 0x34, 0xD4, 0x7F, 0x17, 0x5B, 0x84, 0x04, 0xD0, 0xE3, 0x1B, 0xA8, 0xE1, 0x04, 0x87, 0x51, 0xA2, 0x38, 0xF6, 0x4B, 0xE0, 0x6B, 0x42, 0x96, 0x2B, 0xC1, 0x8D, 0x59, 0xBB, 0xF3, 0xAF, 0x02, 0xE8, 0x26, 0x83, 0x08, 0x48, 0xD6,
+    0x5C, 0xC6, 0x03, 0x57, 0xE2, 0x8C, 0xAF, 0x09, 0xB9, 0xE3, 0x75, 0x17, 0xAF, 0x44, 0x21, 0x57, 0x01, 0x8B, 0xDE, 0x72, 0x24, 0xB0, 0xE5, 0x80, 0xDD, 0xB8, 0x6A, 0x21, 0x5F, 0xE8, 0xAF, 0xCB, 0xA2, 0x37, 0x93, 0x56, 0xB6, 0x47, 0x68, 0xD1, 0xB9, 0x12, 0xCB, 0x61, 0x8F, 0x75, 0x30, 0x8B, 0xB7, 0xEB, 0x66, 0xDC, 0x3C, 0x0E, 0x6D, 0x2D, 0x50, 0x8B, 0x6B, 0x43, 0xB2, 0xDC, 0x7B, 0xA3,
+    0x92, 0x3B, 0x77, 0xCC, 0x2F, 0x6A, 0x3E, 0xD0, 0x64, 0x12, 0xA4, 0xCE, 0xE9, 0x83, 0x9C, 0xB2, 0xF5, 0x31, 0x50, 0x9D, 0xCB, 0x62, 0x2B, 0xA2, 0x1D, 0x8E, 0xF7, 0xC8, 0x9D, 0x42, 0x2D, 0x71, 0x4B, 0xBC, 0xF5, 0x23, 0x8A, 0xF0, 0x2C, 0x9B, 0x40, 0x77, 0xED, 0x18, 0xAE, 0xD2, 0x10, 0xF3, 0x21, 0x53, 0x03, 0x9F, 0x7A, 0xEE, 0xD0, 0x9A, 0xE0, 0x1F, 0xBF, 0xFE, 0x9C, 0x39, 0x11, 0xF2,
+    0x23, 0xB3, 0xEC, 0x9E, 0x1E, 0xFD, 0x9A, 0x26, 0x87, 0xF4, 0x51, 0x39, 0x67, 0x1B, 0xDA, 0x3D, 0x7C, 0xC5, 0x16, 0xEF, 0x0C, 0x8F, 0x3D, 0xD7, 0x58, 0x31, 0x4C, 0x78, 0x07, 0x88, 0xFA, 0x0D, 0xE5, 0x13, 0x61, 0x74, 0xCA, 0x0D, 0x7D, 0xEA, 0x15, 0x93, 0x4F, 0xBD, 0x02, 0x47, 0xA1, 0x5D, 0xC7, 0x84, 0xD3, 0x4A, 0xB7, 0x31, 0x86, 0x09, 0x64, 0xA4, 0x2E, 0x57, 0x15, 0x73, 0xCA, 0x4E,
+    0x85, 0x0D, 0x64, 0x46, 0xB7, 0x78, 0x53, 0xDB, 0xA8, 0x2E, 0x7E, 0x99, 0xBA, 0x2C, 0xC8, 0x5C, 0x0F, 0xAA, 0x67, 0x82, 0x49, 0xC0, 0xFE, 0x6C, 0xB4, 0xCE, 0x14, 0xAD, 0xDE, 0xC0, 0x53, 0x9B, 0x7E, 0xB1, 0xD7, 0x42, 0xA3, 0x35, 0xBE, 0x5B, 0xB0, 0xE0, 0x2C, 0x6F, 0xFA, 0x86, 0xDC, 0x79, 0x3A, 0xA6, 0x28, 0xE7, 0x1D, 0x5B, 0xAD, 0x49, 0xC4, 0xE9, 0x76, 0xD2, 0x8F, 0xE4, 0x63, 0xBD,
+    0xF7, 0xD9, 0x33, 0x90, 0xE7, 0x16, 0xC5, 0x07, 0x46, 0xBF, 0xDD, 0x02, 0xFA, 0x4B, 0x77, 0xEF, 0x8D, 0xE6, 0x3A, 0xDA, 0xA4, 0x74, 0x17, 0x08, 0x7E, 0x95, 0xF3, 0x5D, 0x3A, 0x26, 0x69, 0xD5, 0x3D, 0x2C, 0x91, 0x00, 0xFD, 0x6A, 0xDB, 0x46, 0x06, 0x82, 0xCF, 0xA5, 0x59, 0x35, 0x22, 0xB8, 0x0B, 0xF9, 0x62, 0x95, 0x75, 0xCA, 0xFB, 0x23, 0x80, 0x3D, 0x0F, 0xB6, 0x4A, 0x01, 0xA7, 0x29,
+    0x59, 0xA2, 0x72, 0xD2, 0x0E, 0x86, 0x62, 0xF6, 0x7B, 0x5E, 0x16, 0x6B, 0x87, 0xAC, 0x0C, 0xA2, 0x24, 0x52, 0xCC, 0x04, 0x2D, 0xEB, 0xAE, 0x53, 0xE8, 0x41, 0x0E, 0x72, 0x8E, 0xEC, 0xA6, 0x1C, 0xBE, 0x5D, 0xE7, 0xAC, 0x52, 0x8D, 0x25, 0x9D, 0xF7, 0x65, 0x3F, 0x1E, 0xC4, 0x94, 0xE9, 0x4F, 0x6E, 0xCE, 0x43, 0xBE, 0x07, 0x8E, 0x36, 0xDE, 0x97, 0x5D, 0xF3, 0x9E, 0x32, 0xEE, 0x7C, 0x3F,
+    0x09, 0xC7, 0x25, 0x52, 0xA9, 0x40, 0xB5, 0x92, 0x12, 0xEB, 0xB1, 0xD3, 0x34, 0xE3, 0x62, 0xC2, 0x35, 0x70, 0xB3, 0x98, 0x60, 0x40, 0x91, 0xD4, 0x2D, 0xC0, 0xA0, 0xDB, 0xB2, 0x03, 0x7B, 0x46, 0xF8, 0x83, 0x24, 0x75, 0xC7, 0x19, 0xB9, 0x78, 0xC8, 0x10, 0x90, 0xEC, 0x76, 0x0A, 0xD2, 0xAB, 0x8C, 0x1E, 0x9E, 0x32, 0xF1, 0x50, 0x69, 0xA7, 0x05, 0xD4, 0x15, 0x83, 0x66, 0xBA, 0xD1, 0x97,
+    0xE9, 0x81, 0xB4, 0xFA, 0x6E, 0xDE, 0x29, 0xCC, 0x3A, 0x9F, 0x26, 0x55, 0x96, 0x1D, 0x43, 0xD6, 0x92, 0xFC, 0x13, 0x80, 0xE0, 0xBE, 0x14, 0x68, 0x87, 0x5B, 0x22, 0x4E, 0x32, 0xCD, 0x5A, 0xDD, 0x99, 0x0D, 0xCF, 0x47, 0x30, 0xEE, 0x5E, 0x3D, 0x2B, 0xAB, 0xDA, 0x4C, 0xB6, 0x65, 0x3E, 0x2C, 0xF1, 0x5A, 0xDF, 0x70, 0xAE, 0xD0, 0x1C, 0xBE, 0x7A, 0x4C, 0xAC, 0xCB, 0x25, 0x51, 0x1B, 0x6C,
+    0x2E, 0x4D, 0x1B, 0x37, 0x93, 0x00, 0x55, 0x70, 0xE5, 0x83, 0x45, 0xC6, 0x79, 0xF3, 0xB6, 0x7E, 0x07, 0x5B, 0xC9, 0x4A, 0x24, 0x71, 0xF9, 0x00, 0xAA, 0xE6, 0xC6, 0x6E, 0xF7, 0x89, 0x27, 0xAE, 0x35, 0x68, 0xB2, 0xE4, 0x85, 0xA4, 0xD3, 0x97, 0xF2, 0x55, 0x7F, 0x31, 0x21, 0xFE, 0xA1, 0x7C, 0x00, 0xC3, 0x84, 0x10, 0x29, 0x87, 0x3F, 0xEA, 0x2D, 0xF8, 0x6D, 0x39, 0xE0, 0x92, 0xFC, 0xAD,
+    0xDB, 0x9C, 0xE6, 0x5D, 0xC3, 0xF2, 0xA6, 0xBD, 0x0B, 0x62, 0xFD, 0xAA, 0x04, 0x65, 0x2C, 0x4F, 0xE7, 0xA3, 0x2F, 0xF0, 0xAF, 0x9B, 0x50, 0xC9, 0x33, 0x76, 0x0C, 0x92, 0x43, 0xB8, 0x1A, 0x72, 0xF2, 0x52, 0x90, 0x09, 0x63, 0x14, 0x4D, 0x02, 0x70, 0x16, 0xC3, 0x99, 0xDE, 0x85, 0x58, 0xCD, 0x4C, 0xAC, 0x38, 0xEE, 0x54, 0xDC, 0x9F, 0x59, 0x8D, 0x1E, 0x9B, 0xB8, 0x08, 0x7A, 0x3E, 0x5F,
+    0x04, 0x87, 0xB9, 0x79, 0x21, 0x81, 0x3D, 0x17, 0x8E, 0xD8, 0x1F, 0x35, 0xD5, 0xA1, 0xDF, 0x8F, 0x15, 0xC0, 0x67, 0x88, 0x3B, 0x1C, 0xD8, 0x8F, 0x45, 0xEF, 0xA2, 0x19, 0xE1, 0x60, 0xC8, 0x95, 0xD6, 0x16, 0xC1, 0x3B, 0xF5, 0xC4, 0x80, 0xE4, 0xB1, 0xD8, 0x62, 0x43, 0x06, 0xB2, 0x13, 0xE7, 0x26, 0x8F, 0x61, 0xCA, 0x74, 0xB9, 0x03, 0x6A, 0xC9, 0xDC, 0x45, 0x5F, 0xEF, 0xA7, 0x23, 0xC2,
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+    0xC1, 0x55, 0xE4, 0x68, 0x1C, 0x9F, 0x05, 0xEF, 0x4B, 0x1B, 0xF8, 0xB1, 0x3B, 0xA7, 0x0D, 0xCD, 0x3F, 0xC6, 0x22, 0x50, 0xE0, 0x6B, 0xFC, 0x8E, 0x23, 0xEF, 0x1A, 0xDB, 0x5E, 0xFC, 0x22, 0xD7, 0xA7, 0xE3, 0x8C, 0xB1, 0x37, 0x84, 0x2A, 0x68, 0x8D, 0x14, 0x6C, 0xD6, 0xA8, 0x85, 0x2F, 0x6F, 0xAF, 0x19, 0x79, 0x4B, 0x2E, 0x6E, 0x40, 0xF3, 0xCB, 0x4B, 0x95, 0x3A, 0x15, 0x03, 0xB0, 0x1F,
+    0x2D, 0xA6, 0x8C, 0x26, 0xD9, 0xC2, 0x72, 0x25, 0xB7, 0x8D, 0x31, 0x71, 0xD0, 0x52, 0x85, 0x68, 0x13, 0x5F, 0x89, 0x33, 0x7D, 0x06, 0x48, 0x35, 0xC3, 0x63, 0x95, 0x30, 0xB0, 0x76, 0x4C, 0x80, 0x2D, 0x3E, 0xC3, 0x04, 0x52, 0xE6, 0x0E, 0xC9, 0xEF, 0x2F, 0x9A, 0x4C, 0x13, 0x5E, 0xE0, 0x91, 0x14, 0xF0, 0x06, 0xCD, 0x9C, 0xE4, 0x23, 0xBA, 0x86, 0x18, 0xE8, 0x57, 0xBF, 0x8E, 0x46, 0xDE,
+    0x72, 0x06, 0xBC, 0x3B, 0x7D, 0x4E, 0x34, 0xDF, 0x66, 0xD4, 0x58, 0xEA, 0x26, 0x95, 0xFD, 0xB2, 0xDA, 0x9F, 0xE8, 0xCD, 0xB4, 0x9C, 0xD4, 0x7A, 0xAC, 0xD0, 0x45, 0xEB, 0x11, 0xCC, 0x05, 0xB7, 0xF2, 0x59, 0x7A, 0xFB, 0x9A, 0x6F, 0xB3, 0x57, 0x40, 0xBC, 0xDC, 0x81, 0xF3, 0xB4, 0x08, 0xCB, 0x52, 0x6A, 0xBD, 0x8C, 0x5F, 0x0C, 0xA5, 0x53, 0x70, 0x0A, 0xD1, 0xA8, 0x74, 0xF3, 0x60, 0x97,
+    0x40, 0xD3, 0xFE, 0x5F, 0xAF, 0xF2, 0x89, 0x9D, 0x41, 0xA6, 0x07, 0x81, 0xBB, 0x1B, 0x44, 0x2D, 0x7F, 0x03, 0x48, 0x16, 0x5D, 0x11, 0xE6, 0x56, 0x18, 0x02, 0x73, 0xA0, 0x59, 0x8B, 0xE2, 0x67, 0x99, 0x19, 0xCA, 0x25, 0x44, 0xD8, 0x1D, 0xA0, 0x88, 0x08, 0x62, 0x21, 0x35, 0x97, 0x45, 0x7B, 0xE5, 0xA6, 0x27, 0x3F, 0xF5, 0x7D, 0xD5, 0x2A, 0xFD, 0xA0, 0x64, 0x30, 0x21, 0xCC, 0x0D, 0xE9,
+    0x81, 0x54, 0x12, 0x99, 0x18, 0x07, 0xCD, 0x11, 0xE5, 0x16, 0xC7, 0x49, 0xA1, 0xDC, 0x75, 0xC4, 0x57, 0xF2, 0xA8, 0x74, 0xF8, 0x8C, 0x32, 0xA1, 0xF6, 0x88, 0xD8, 0x25, 0xC2, 0x36, 0xA9, 0x45, 0x28, 0xDD, 0xA9, 0x5F, 0xBD, 0x82, 0x34, 0xE2, 0x73, 0xF9, 0xAD, 0xCF, 0x72, 0xEA, 0xBC, 0x23, 0x39, 0x95, 0xD1, 0x55, 0x1C, 0xAD, 0x38, 0x92, 0xC4, 0x43, 0xDF, 0x8B, 0x50, 0xAD, 0x34, 0xA2,
+    0x23, 0xB3, 0x8A, 0xE4, 0x6D, 0xBB, 0x53, 0x79, 0x61, 0x86, 0xF4, 0x6C, 0x36, 0x5D, 0xED, 0x0E, 0x93, 0x36, 0xBE, 0x28, 0xC7, 0x42, 0x6E, 0xBB, 0x0F, 0x66, 0xB6, 0x4C, 0xF9, 0x7D, 0x1C, 0xEF, 0x89, 0x71, 0x3C, 0x8E, 0x0A, 0xF5, 0x64, 0xC6, 0x25, 0x4F, 0x3B, 0x9E, 0x53, 0x19, 0x60, 0x8A, 0xFD, 0x02, 0x66, 0xE1, 0xBF, 0x6E, 0xEA, 0x5D, 0x14, 0x78, 0x02, 0xB9, 0xF8, 0x7E, 0x5C, 0xC4,
+    0x6B, 0xCC, 0x31, 0x45, 0xD8, 0xA4, 0x3C, 0xFB, 0xC1, 0x31, 0xB0, 0x24, 0xD0, 0x91, 0x18, 0xAD, 0xD5, 0x66, 0x84, 0x53, 0x96, 0xDF, 0x23, 0xCE, 0x49, 0xE5, 0x34, 0x94, 0x07, 0x65, 0xD4, 0x53, 0xB2, 0x00, 0xEC, 0xD5, 0x2B, 0xAB, 0x46, 0x0E, 0xB5, 0x8E, 0xE6, 0x05, 0x85, 0xC5, 0xDA, 0xAA, 0x4A, 0xB7, 0x7A, 0x30, 0x9A, 0x49, 0x0B, 0x87, 0xB2, 0xEF, 0x97, 0x18, 0x3E, 0xD7, 0x0F, 0xEE,
+    0x49, 0x00, 0xF7, 0x61, 0x1E, 0x81, 0x27, 0x92, 0x1B, 0x4B, 0x97, 0xDE, 0x02, 0xB9, 0x81, 0x48, 0x15, 0xE6, 0x0A, 0xEE, 0x16, 0xAB, 0x7E, 0x5C, 0x9B, 0x1B, 0xAC, 0x72, 0xDF, 0xBC, 0x98, 0x2E, 0xC9, 0x63, 0x9E, 0x4F, 0x70, 0x92, 0xE8, 0x7E, 0xD9, 0x67, 0x2E, 0xB1, 0xF7, 0x22, 0x34, 0x72, 0x0F, 0xD4, 0x16, 0x89, 0xF9, 0x24, 0xC8, 0xE1, 0x4E, 0x35, 0x62, 0xCE, 0x6F, 0x9F, 0x2C, 0x94,
+    0xD9, 0xA9, 0x7A, 0x95, 0xC8, 0xEB, 0x5C, 0xD4, 0xAB, 0xE6, 0x5E, 0x77, 0x3E, 0x55, 0xFB, 0x6F, 0xA0, 0xC5, 0x41, 0xB4, 0x68, 0x00, 0xFD, 0x38, 0xD5, 0x83, 0xF5, 0x21, 0x56, 0x3C, 0x0E, 0x82, 0xFB, 0x22, 0x37, 0xC4, 0x19, 0xB8, 0x59, 0x37, 0xA2, 0x1D, 0xC9, 0x57, 0x7A, 0x44, 0x9A, 0xF1, 0x54, 0xA0, 0xE9, 0x44, 0xB4, 0x5B, 0xA0, 0x71, 0x27, 0xC2, 0xA6, 0x11, 0xE8, 0x51, 0xBE, 0x77,
+    0x20, 0x57, 0xC0, 0x10, 0x36, 0xA7, 0x04, 0x71, 0x2D, 0x82, 0x11, 0xF3, 0xA3, 0xC6, 0x28, 0xE0, 0x33, 0x5D, 0x98, 0x7B, 0xD9, 0x4D, 0x90, 0xB5, 0x28, 0x67, 0x45, 0xC8, 0x86, 0xAE, 0xE7, 0x44, 0xA6, 0x75, 0xDE, 0x86, 0xF6, 0x26, 0xD3, 0x03, 0xFE, 0x75, 0x3F, 0xDE, 0xA6, 0x64, 0xBD, 0x1C, 0x80, 0xC2, 0x63, 0x07, 0x76, 0xD8, 0x3B, 0x04, 0x91, 0xFA, 0x78, 0x44, 0x88, 0x06, 0xFC, 0x38
+};

src/button_handler.cpp

@@ -0,0 +1,126 @@
+#include "button_handler.h"
+#include "power_manager.h"
+#include "settings.h"
+
+void ButtonHandler::begin(PowerManager& power, SettingsManager& settings) {
+    _power = &power;
+    _settings = &settings;
+
+    pinMode(PIN_BTN_TOP, INPUT_PULLUP);
+    pinMode(PIN_BTN_UP, INPUT_PULLUP);
+    pinMode(PIN_BTN_DOWN, INPUT_PULLUP);
+
+    Serial.println("[buttons] Initialized (G1=random, G10=next, G9=pause)");
+}
+
+ButtonEvent ButtonHandler::poll() {
+    unsigned long now = millis();
+
+    bool topNow = (digitalRead(PIN_BTN_TOP) == LOW);
+    bool upNow = (digitalRead(PIN_BTN_UP) == LOW);
+    bool downNow = (digitalRead(PIN_BTN_DOWN) == LOW);
+
+    // Track press start times
+    if (topNow && !_btnTopPressed) {
+        _btnTopPressTime = now;
+        _btnTopPressed = true;
+    } else if (!topNow) {
+        _btnTopPressed = false;
+    }
+
+    if (upNow && !_btnUpPressed) {
+        _btnUpPressTime = now;
+        _btnUpPressed = true;
+    } else if (!upNow) {
+        _btnUpPressed = false;
+    }
+
+    if (downNow && !_btnDownPressed) {
+        _btnDownPressTime = now;
+        _btnDownPressed = true;
+    } else if (!downNow) {
+        _btnDownPressed = false;
+    }
+
+    // Check combos first (higher priority)
+    // BTN_TOP + BTN_DOWN held 3s = deep sleep
+    if (_btnTopPressed && _btnDownPressed) {
+        unsigned long holdTime = now - max(_btnTopPressTime, _btnDownPressTime);
+        if (holdTime >= COMBO_HOLD_MS) {
+            Serial.println("[buttons] Combo: deep sleep");
+            _power->flashLED(255, 0, 0, 500);
+            return ButtonEvent::DeepSleep;
+        }
+    }
+
+    // BTN_UP held 5s = factory reset
+    if (_btnUpPressed && !_btnTopPressed && !_btnDownPressed) {
+        if (now - _btnUpPressTime >= FACTORY_RESET_HOLD_MS) {
+            Serial.println("[buttons] Combo: factory reset");
+            _power->flashLED(255, 255, 0, 1000);
+            _settings->factoryReset();
+            return ButtonEvent::FactoryReset;
+        }
+    }
+
+    // Single press detection (on release, with debounce)
+    if (!debounced(now)) {
+        return ButtonEvent::None;
+    }
+
+    // BTN_TOP released (was short press) — double-press detection
+    if (!topNow && _btnTopPressTime > 0 &&
+        (now - _btnTopPressTime < COMBO_HOLD_MS) &&
+        (now - _btnTopPressTime > BUTTON_DEBOUNCE_MS)) {
+        _btnTopPressTime = 0;
+        _lastDebounce = now;
+
+        if (_btnTopPendingSingle && (now - _btnTopLastRelease) < DOUBLE_PRESS_WINDOW) {
+            // Second press within window -> deep sleep
+            _btnTopPendingSingle = false;
+            Serial.println("[buttons] BTN_TOP: double-press -> deep sleep");
+            _power->flashLED(255, 0, 0, 500);
+            return ButtonEvent::DeepSleep;
+        } else {
+            // First press — mark as pending, wait for possible second
+            _btnTopLastRelease = now;
+            _btnTopPendingSingle = true;
+        }
+    }
+
+    // Emit pending single press after double-press window expires
+    if (_btnTopPendingSingle && (now - _btnTopLastRelease) >= DOUBLE_PRESS_WINDOW) {
+        _btnTopPendingSingle = false;
+        _power->flashLED(255, 255, 255);
+        Serial.println("[buttons] BTN_TOP: random photo");
+        return ButtonEvent::RandomPhoto;
+    }
+
+    // BTN_UP released (was short press)
+    if (!upNow && _btnUpPressTime > 0 &&
+        (now - _btnUpPressTime < FACTORY_RESET_HOLD_MS) &&
+        (now - _btnUpPressTime > BUTTON_DEBOUNCE_MS)) {
+        _btnUpPressTime = 0;
+        _power->flashLED(255, 255, 255);
+        Serial.println("[buttons] BTN_UP: next photo");
+        _lastDebounce = now;
+        return ButtonEvent::NextPhoto;
+    }
+
+    // BTN_DOWN released (was short press)
+    if (!downNow && _btnDownPressTime > 0 &&
+        (now - _btnDownPressTime < COMBO_HOLD_MS) &&
+        (now - _btnDownPressTime > BUTTON_DEBOUNCE_MS)) {
+        _btnDownPressTime = 0;
+        _power->flashLED(255, 255, 255);
+        Serial.println("[buttons] BTN_DOWN: play/pause");
+        _lastDebounce = now;
+        return ButtonEvent::PlayPause;
+    }
+
+    return ButtonEvent::None;
+}
+
+bool ButtonHandler::debounced(unsigned long now) {
+    return (now - _lastDebounce) > BUTTON_DEBOUNCE_MS;
+}

src/button_handler.h

@@ -0,0 +1,43 @@
+#pragma once
+
+#include <Arduino.h>
+#include "config.h"
+
+class PowerManager;
+class SettingsManager;
+
+enum class ButtonEvent : uint8_t {
+    None,
+    NextPhoto,
+    RandomPhoto,
+    PlayPause,
+    DeepSleep,
+    FactoryReset
+};
+
+class ButtonHandler {
+public:
+    void begin(PowerManager& power, SettingsManager& settings);
+    ButtonEvent poll();
+
+private:
+    PowerManager* _power = nullptr;
+    SettingsManager* _settings = nullptr;
+
+    unsigned long _btnTopPressTime = 0;
+    unsigned long _btnUpPressTime = 0;
+    unsigned long _btnDownPressTime = 0;
+
+    bool _btnTopPressed = false;
+    bool _btnUpPressed = false;
+    bool _btnDownPressed = false;
+
+    // Double-press detection for BTN_TOP
+    unsigned long _btnTopLastRelease = 0;
+    bool _btnTopPendingSingle = false;
+    static constexpr unsigned long DOUBLE_PRESS_WINDOW = 400;
+
+    unsigned long _lastDebounce = 0;
+
+    bool debounced(unsigned long now);
+};

src/config.h

@@ -3,8 +3,8 @@
 // --- Pin Definitions ---
 // Buttons
 #define PIN_BTN_TOP       1   // G1 - Random photo
-#define PIN_BTN_UP        9   // G9 - Next photo
-#define PIN_BTN_DOWN      10  // G10 - Play/Pause
+#define PIN_BTN_UP        10  // G10 - Next photo
+#define PIN_BTN_DOWN      9   // G9 - Play/Pause
 
 // RGB LEDs (NeoPixel)
 #define PIN_RGB_LED       21
@@ -38,6 +38,9 @@
 #define DEFAULT_META_FLAGS      0x00
 #define DEFAULT_META_POS        0   // 0=bottom
 #define DEFAULT_LED_BRIGHTNESS  50
+#define DEFAULT_PIPELINE_MODE   0   // 0=dynamic, 1=balanced, 2=none
+#define DEFAULT_DITHER_NOISE    0   // 1=error scatter ON, 0=OFF (driver dither fix makes this unnecessary)
+#define DEFAULT_TIMER_BATCH     10  // Deep sleep batch cache size (1-50)
 #define DEFAULT_IMMICH_URL      "https://photos.example.com"
 
 // --- Timing ---
@@ -62,23 +65,23 @@
 #define PORTRAIT_GAP_PX         8
 #define PORTRAIT_WIDTH          267  // (DISPLAY_HEIGHT * 2) / 3
 
-// --- Dither Palette (Spectra 6) ---
-// Initial values — calibrate on real hardware
-#define PALETTE_BLACK_R   0
-#define PALETTE_BLACK_G   0
-#define PALETTE_BLACK_B   0
-#define PALETTE_WHITE_R   255
-#define PALETTE_WHITE_G   255
-#define PALETTE_WHITE_B   255
-#define PALETTE_RED_R     200
-#define PALETTE_RED_G     30
-#define PALETTE_RED_B     30
-#define PALETTE_GREEN_R   30
-#define PALETTE_GREEN_G   160
-#define PALETTE_GREEN_B   30
-#define PALETTE_BLUE_R    30
-#define PALETTE_BLUE_G    30
-#define PALETTE_BLUE_B    200
-#define PALETTE_YELLOW_R  220
-#define PALETTE_YELLOW_G  200
-#define PALETTE_YELLOW_B  30
+// --- Dither Palette (Spectra 6 calibrated, from epdoptimize "spectra6") ---
+// Measured display appearance — what the panel actually shows
+#define PALETTE_BLACK_R   0x1F
+#define PALETTE_BLACK_G   0x22
+#define PALETTE_BLACK_B   0x26
+#define PALETTE_WHITE_R   0xB9
+#define PALETTE_WHITE_G   0xC7
+#define PALETTE_WHITE_B   0xC9
+#define PALETTE_RED_R     0x62
+#define PALETTE_RED_G     0x20
+#define PALETTE_RED_B     0x1E
+#define PALETTE_GREEN_R   0x35
+#define PALETTE_GREEN_G   0x56
+#define PALETTE_GREEN_B   0x3A
+#define PALETTE_BLUE_R    0x23
+#define PALETTE_BLUE_G    0x3F
+#define PALETTE_BLUE_B    0x8E
+#define PALETTE_YELLOW_R  0xC1
+#define PALETTE_YELLOW_G  0xBB
+#define PALETTE_YELLOW_B  0x1E

src/display_manager.cpp

@@ -0,0 +1,490 @@
+#include "display_manager.h"
+#include "power_manager.h"
+#include <M5Unified.h>
+
+// EPD-exact palette: values produce distance=0 in Panel_ED2208's
+// _rgb_to_epd_color nearest-color lookup, guaranteeing correct mapping.
+// Order matches our pipeline's palette indices (0=black..5=yellow).
+static const lgfx::bgr888_t EPD_PALETTE[6] = {
+    {0, 0, 0},         // Black  (EPD_BLACK)
+    {255, 255, 255},   // White  (EPD_WHITE)
+    {191, 0, 0},       // Red    (EPD_RED)
+    {67, 138, 28},     // Green  (EPD_GREEN)
+    {100, 64, 255},    // Blue   (EPD_BLUE)
+    {255, 243, 56}     // Yellow (EPD_YELLOW)
+};
+
+void DisplayManager::begin(PowerManager& power) {
+    _power = &power;
+    _display = &M5.Display;
+
+    // Ensure no automatic e-ink refreshes happen
+    _display->setAutoDisplay(false);
+
+    // Set rotation for landscape (device physically rotated)
+    _display->setRotation(3);
+
+    // Disable the panel driver's internal dithering (epd_quality applies a diagonal
+    // bias pattern via _dither_row_rgb_pair). Since our ImagePipeline already does
+    // proper Floyd-Steinberg dithering to the 6-color palette, the driver should
+    // just do a clean nearest-color lookup with no additional spatial bias.
+    // On Panel_ED2208 this only affects the dither function — NOT refresh quality.
+    _display->setEpdMode(epd_mode_t::epd_fastest);
+
+    Serial.printf("[display] Initialized: %dx%d, rotation=%d, epd_mode=fastest (no driver dither)\n",
+                  _display->width(), _display->height(), _display->getRotation());
+}
+
+void DisplayManager::showSetupScreen() {
+    _power->enableEPDPower();
+
+    // Batch all drawing — nothing hits the panel until display() at the end
+    _display->startWrite();
+    _display->fillScreen(TFT_WHITE);
+
+    // Generate QR code for WiFi auto-connect
+    const char* qrData = "WIFI:T:nopass;S:PaperColor-Setup;;";
+    QRCode qrcode;
+    uint8_t qrcodeData[qrcode_getBufferSize(6)];
+    qrcode_initText(&qrcode, qrcodeData, 6, ECC_LOW, qrData);
+
+    // Draw QR code centered vertically, left-of-center horizontally
+    int qrSize = qrcode.size;
+    int scale = 4;
+    int qrPixels = qrSize * scale;
+    int qrX = (DISPLAY_WIDTH / 3) - (qrPixels / 2);
+    int qrY = (DISPLAY_HEIGHT - qrPixels) / 2;
+
+    for (int y = 0; y < qrSize; y++) {
+        for (int x = 0; x < qrSize; x++) {
+            uint16_t color = qrcode_getModule(&qrcode, x, y) ? TFT_BLACK : TFT_WHITE;
+            _display->fillRect(qrX + x * scale, qrY + y * scale, scale, scale, color);
+        }
+    }
+
+    // Text instructions to the right of QR code
+    int textX = DISPLAY_WIDTH / 2 + 40;
+    _display->setTextColor(TFT_BLACK);
+    _display->setTextDatum(middle_left);
+    _display->setTextSize(2);
+    _display->drawString("PaperColor", textX, DISPLAY_HEIGHT / 2 - 60);
+    _display->setTextSize(1);
+    _display->drawString("Scan QR to connect", textX, DISPLAY_HEIGHT / 2 - 20);
+    _display->drawString("or join WiFi:", textX, DISPLAY_HEIGHT / 2 + 10);
+    _display->setTextSize(1.5);
+    _display->drawString("PaperColor-Setup", textX, DISPLAY_HEIGHT / 2 + 40);
+    _display->setTextSize(1);
+    _display->drawString("Then open:", textX, DISPLAY_HEIGHT / 2 + 70);
+    _display->drawString("192.168.4.1", textX, DISPLAY_HEIGHT / 2 + 95);
+
+    _display->endWrite();
+
+    // Single e-ink refresh — the only panel update during boot
+    triggerRefresh();
+    _power->disableEPDPower();
+}
+
+void DisplayManager::showImage(const ProcessedImage& img) {
+    if (!img.valid || img.framebuffer == nullptr) {
+        Serial.println("[display] Invalid image — skipping");
+        return;
+    }
+
+    _power->enableEPDPower();
+
+    Serial.println("[display] Writing framebuffer to e-ink...");
+
+    // Bulk-write framebuffer using palette lookup (handles rotation internally)
+    _display->startWrite();
+    _display->pushImage(0, 0, img.width, img.height,
+        img.framebuffer, lgfx::color_depth_t::palette_8bit, EPD_PALETTE);
+    _display->endWrite();
+    // Do NOT refresh here — caller should add metadata overlay then call refresh()
+}
+
+void DisplayManager::showMessage(const char* title, const char* body) {
+    _power->enableEPDPower();
+
+    _display->startWrite();
+    _display->fillScreen(TFT_WHITE);
+    _display->setTextColor(TFT_BLACK);
+    _display->setTextDatum(middle_center);
+    _display->setTextSize(2);
+    _display->drawString(title, DISPLAY_WIDTH / 2, DISPLAY_HEIGHT / 2 - 30);
+    _display->setTextSize(1);
+    _display->drawString(body, DISPLAY_WIDTH / 2, DISPLAY_HEIGHT / 2 + 20);
+    _display->endWrite();
+
+    triggerRefresh();
+    _power->disableEPDPower();
+}
+
+void DisplayManager::showMetadata(const AssetInfo& info, uint8_t metaFlags, MetaPosition pos,
+                                   const String& dateFmt, const String& timeFmt) {
+    showMetadataInRegion(info, metaFlags, pos, 0, 0, DISPLAY_WIDTH, DISPLAY_HEIGHT, dateFmt, timeFmt);
+}
+
+void DisplayManager::showMetadataInRegion(const AssetInfo& info, uint8_t metaFlags, MetaPosition pos,
+                                           uint16_t regionX, uint16_t regionY,
+                                           uint16_t regionW, uint16_t regionH,
+                                           const String& dateFmt, const String& timeFmt) {
+    if (metaFlags == 0) return;
+
+    // Build metadata string (excluding location — it gets its own badge)
+    String metaText = "";
+
+    // Parse ISO datetime (YYYY-MM-DDTHH:MM:SS) into struct tm for strftime
+    if (((metaFlags & META_DATE) || (metaFlags & META_TIME)) && info.dateTime.length() >= 19) {
+        struct tm t = {};
+        sscanf(info.dateTime.c_str(), "%d-%d-%dT%d:%d:%d",
+               &t.tm_year, &t.tm_mon, &t.tm_mday,
+               &t.tm_hour, &t.tm_min, &t.tm_sec);
+        t.tm_year -= 1900;
+        t.tm_mon -= 1;
+
+        char buf[64];
+        if ((metaFlags & META_DATE) && (metaFlags & META_TIME)) {
+            String combinedFmt = dateFmt + " " + timeFmt;
+            strftime(buf, sizeof(buf), combinedFmt.c_str(), &t);
+            metaText += buf;
+        } else if (metaFlags & META_DATE) {
+            strftime(buf, sizeof(buf), dateFmt.c_str(), &t);
+            metaText += buf;
+        } else {
+            strftime(buf, sizeof(buf), timeFmt.c_str(), &t);
+            metaText += buf;
+        }
+    } else if ((metaFlags & META_DATE) && info.dateTime.length() >= 10) {
+        // Fallback if datetime is too short for full parse
+        metaText += info.dateTime.substring(0, 10);
+    }
+    if ((metaFlags & META_PEOPLE) && !info.people.empty()) {
+        if (metaText.length() > 0) metaText += "  |  ";
+        for (size_t i = 0; i < info.people.size(); i++) {
+            if (i > 0) metaText += ", ";
+            metaText += info.people[i];
+        }
+    }
+    if ((metaFlags & META_ALBUM)) {
+        // Album name would need to be passed separately
+    }
+    if ((metaFlags & META_CAMERA) && info.camera.length() > 0) {
+        if (metaText.length() > 0) metaText += "  |  ";
+        metaText += info.camera;
+    }
+
+    // Location gets its own badge in lower-left
+    String locationText = "";
+    if ((metaFlags & META_LOCATION) && info.city.length() > 0) {
+        locationText = info.city;
+    }
+
+    if (metaText.length() == 0 && locationText.length() == 0) return;
+
+    static constexpr uint16_t MARGIN = 8;
+    static constexpr uint16_t PAD_X = 8;
+    static constexpr uint16_t PAD_Y = 5;
+    static constexpr uint16_t TEXT_H = 20;
+    static constexpr uint16_t ICON_SIZE = 12;
+    static constexpr uint16_t ICON_GAP = 6;
+
+    bool showIcons = (regionW == DISPLAY_WIDTH);
+
+    _display->setTextSize(1.5f);
+    _display->setTextColor(TFT_WHITE);
+
+    // Track where the main badge ends up (for location badge offset)
+    uint16_t mainBadgeBottomY = 0;
+
+    // Draw main metadata badge (date/time/people/camera) at configured position
+    if (metaText.length() > 0) {
+        switch (pos) {
+            case MetaPosition::CaptionBottom:
+            case MetaPosition::CaptionTop: {
+                uint16_t barH = 36;
+                uint16_t barY = (pos == MetaPosition::CaptionTop)
+                    ? regionY
+                    : regionY + regionH - barH;
+                _display->fillRect(regionX, barY, regionW, barH, TFT_BLACK);
+                _display->setTextDatum(middle_center);
+                _display->drawString(metaText.c_str(), regionX + regionW / 2, barY + barH / 2);
+                break;
+            }
+            case MetaPosition::OverlayTopLeft:
+            case MetaPosition::OverlayTopRight:
+            case MetaPosition::OverlayBottomLeft:
+            case MetaPosition::OverlayBottomRight: {
+                uint16_t textW = _display->textWidth(metaText.c_str());
+                uint16_t iconExtra = showIcons ? (ICON_SIZE + ICON_GAP) : 0;
+                uint16_t badgeW = min((uint16_t)(textW + iconExtra + PAD_X * 2), regionW);
+                uint16_t badgeH = TEXT_H + PAD_Y * 2;
+
+                uint16_t bx, by;
+                switch (pos) {
+                    case MetaPosition::OverlayTopLeft:
+                        bx = regionX + MARGIN;
+                        by = regionY + MARGIN;
+                        break;
+                    case MetaPosition::OverlayTopRight:
+                        bx = regionX + regionW - badgeW - MARGIN;
+                        by = regionY + MARGIN;
+                        break;
+                    case MetaPosition::OverlayBottomLeft:
+                        bx = regionX + MARGIN;
+                        by = regionY + regionH - badgeH - MARGIN;
+                        break;
+                    case MetaPosition::OverlayBottomRight:
+                        bx = regionX + regionW - badgeW - MARGIN;
+                        by = regionY + regionH - badgeH - MARGIN;
+                        break;
+                    default:
+                        bx = regionX + MARGIN;
+                        by = regionY + MARGIN;
+                        break;
+                }
+
+                drawOverlayBadge(bx, by, badgeW, badgeH);
+                _display->setTextDatum(middle_left);
+                uint16_t textX = bx + PAD_X;
+                if (showIcons) {
+                    drawCalendarIcon(bx + PAD_X, by + (badgeH - ICON_SIZE) / 2 - 1, ICON_SIZE);
+                    textX += ICON_SIZE + ICON_GAP;
+                }
+                _display->drawString(metaText.c_str(), textX, by + badgeH / 2);
+                mainBadgeBottomY = by + badgeH;
+                break;
+            }
+        }
+    }
+
+    // Draw location badge in lower-left corner (separate from main badge)
+    if (locationText.length() > 0) {
+        uint16_t locTextW = _display->textWidth(locationText.c_str());
+        uint16_t iconExtra = showIcons ? (ICON_SIZE + ICON_GAP) : 0;
+        uint16_t locBadgeW = min((uint16_t)(locTextW + iconExtra + PAD_X * 2), regionW);
+        uint16_t locBadgeH = TEXT_H + PAD_Y * 2;
+
+        uint16_t lx = regionX + MARGIN;
+        uint16_t ly = regionY + regionH - locBadgeH - MARGIN;
+
+        // If main badge is also in bottom-left, stack location above it
+        if (pos == MetaPosition::OverlayBottomLeft && metaText.length() > 0) {
+            ly = ly - locBadgeH - 4;
+        }
+
+        drawOverlayBadge(lx, ly, locBadgeW, locBadgeH);
+        _display->setTextColor(TFT_WHITE);
+        _display->setTextDatum(middle_left);
+        uint16_t locTextX = lx + PAD_X;
+        if (showIcons) {
+            drawPinIcon(lx + PAD_X, ly + (locBadgeH - ICON_SIZE) / 2 - 1, ICON_SIZE);
+            locTextX += ICON_SIZE + ICON_GAP;
+        }
+        _display->drawString(locationText.c_str(), locTextX, ly + locBadgeH / 2);
+    }
+}
+
+void DisplayManager::drawOverlayBadge(uint16_t x, uint16_t y, uint16_t w, uint16_t h) {
+    static constexpr int16_t R = 4;
+
+    if (!_translucent) {
+        _display->fillRoundRect(x, y, w, h, R, TFT_BLACK);
+        return;
+    }
+
+    // Checkerboard pattern within rounded-rect bounds for 50% opacity effect.
+    // Use fillRoundRect to create a clip mask in black, then punch holes by
+    // restoring every-other pixel. Simpler: just iterate and test corner radii.
+    for (uint16_t py = y; py < y + h; py++) {
+        for (uint16_t px = x; px < x + w; px++) {
+            if ((px + py) % 2 != 0) continue;
+
+            // Check if pixel is inside the rounded rect (corner exclusion)
+            int16_t lx = px - x;
+            int16_t ly = py - y;
+            bool inside = true;
+
+            // Top-left corner
+            if (lx < R && ly < R) {
+                int16_t dx = R - 1 - lx;
+                int16_t dy = R - 1 - ly;
+                inside = (dx * dx + dy * dy) <= (R * R);
+            }
+            // Top-right corner
+            else if (lx >= w - R && ly < R) {
+                int16_t dx = lx - (w - R);
+                int16_t dy = R - 1 - ly;
+                inside = (dx * dx + dy * dy) <= (R * R);
+            }
+            // Bottom-left corner
+            else if (lx < R && ly >= h - R) {
+                int16_t dx = R - 1 - lx;
+                int16_t dy = ly - (h - R);
+                inside = (dx * dx + dy * dy) <= (R * R);
+            }
+            // Bottom-right corner
+            else if (lx >= w - R && ly >= h - R) {
+                int16_t dx = lx - (w - R);
+                int16_t dy = ly - (h - R);
+                inside = (dx * dx + dy * dy) <= (R * R);
+            }
+
+            if (inside) {
+                _display->writePixel(px, py, TFT_BLACK);
+            }
+        }
+    }
+}
+
+void DisplayManager::drawPinIcon(int32_t x, int32_t y, int32_t size) {
+    int32_t r = size * 2 / 5;
+    int32_t cx = x + size / 2;
+    int32_t cy = y + r + 1;
+    _display->fillCircle(cx, cy, r, TFT_WHITE);
+    _display->fillTriangle(cx - r + 1, cy + r / 2, cx + r - 1, cy + r / 2,
+                           cx, y + size - 1, TFT_WHITE);
+    _display->fillCircle(cx, cy, r / 3, TFT_BLACK);
+}
+
+void DisplayManager::drawCalendarIcon(int32_t x, int32_t y, int32_t size) {
+    int32_t bodyY = y + size / 4;
+    int32_t bodyH = size - size / 4;
+    int32_t bodyW = size;
+    _display->drawRect(x, bodyY, bodyW, bodyH, TFT_WHITE);
+    int32_t headerH = bodyH / 3;
+    _display->drawLine(x, bodyY + headerH, x + bodyW - 1, bodyY + headerH, TFT_WHITE);
+    int32_t tabW = 2, tabH = size / 4 + 1;
+    _display->fillRect(x + bodyW / 4, y, tabW, tabH, TFT_WHITE);
+    _display->fillRect(x + bodyW * 3 / 4 - tabW, y, tabW, tabH, TFT_WHITE);
+    int32_t dotSize = max((int32_t)1, size / 6);
+    int32_t gridY = bodyY + headerH + 2;
+    int32_t gridX = x + 2;
+    int32_t gapX = (bodyW - 4) / 3;
+    int32_t gapY = (bodyH - headerH - 3) / 2;
+    for (int row = 0; row < 2; row++)
+        for (int col = 0; col < 3; col++)
+            _display->fillRect(gridX + col * gapX, gridY + row * gapY,
+                               dotSize, dotSize, TFT_WHITE);
+}
+
+void DisplayManager::showSleepIndicator(MetaPosition metaPos) {
+    _power->enableEPDPower();
+
+    static constexpr uint16_t MARGIN = 8;
+    static constexpr uint16_t PAD_X = 6;
+    static constexpr uint16_t PAD_Y = 4;
+
+    _display->setTextSize(1);
+    uint16_t textW = _display->textWidth("SLP");
+    uint16_t textH = 14;
+    uint16_t badgeW = textW + PAD_X * 2;
+    uint16_t badgeH = textH + PAD_Y * 2;
+
+    // Pick a corner opposite to metadata position
+    uint16_t bx, by;
+    switch (metaPos) {
+        case MetaPosition::OverlayTopLeft:
+        case MetaPosition::CaptionTop:
+            bx = DISPLAY_WIDTH - badgeW - MARGIN;
+            by = DISPLAY_HEIGHT - badgeH - MARGIN;
+            break;
+        case MetaPosition::OverlayTopRight:
+            bx = MARGIN;
+            by = DISPLAY_HEIGHT - badgeH - MARGIN;
+            break;
+        case MetaPosition::OverlayBottomLeft:
+            bx = DISPLAY_WIDTH - badgeW - MARGIN;
+            by = MARGIN;
+            break;
+        case MetaPosition::OverlayBottomRight:
+        case MetaPosition::CaptionBottom:
+        default:
+            bx = MARGIN;
+            by = MARGIN;
+            break;
+    }
+
+    drawOverlayBadge(bx, by, badgeW, badgeH);
+    _display->setTextColor(TFT_WHITE);
+    _display->setTextDatum(middle_center);
+    _display->drawString("SLP", bx + badgeW / 2, by + badgeH / 2);
+}
+
+void DisplayManager::showBatteryIndicator(uint8_t percent, MetaPosition metaPos) {
+    static constexpr uint16_t MARGIN = 8;
+    static constexpr uint16_t PAD_X = 6;
+    static constexpr uint16_t PAD_Y = 4;
+
+    // Battery icon dimensions
+    static constexpr uint16_t BATT_W = 20;
+    static constexpr uint16_t BATT_H = 10;
+    static constexpr uint16_t NUB_W = 3;
+    static constexpr uint16_t NUB_H = 5;
+    static constexpr uint16_t GAP = 4;
+
+    // Build percentage text
+    char pctText[5];
+    snprintf(pctText, sizeof(pctText), "%d%%", percent);
+
+    _display->setTextSize(1);
+    uint16_t textW = _display->textWidth(pctText);
+    uint16_t textH = 14;
+
+    // Total badge size: icon + gap + text + padding
+    uint16_t contentW = BATT_W + NUB_W + GAP + textW;
+    uint16_t contentH = max(BATT_H, textH);
+    uint16_t badgeW = contentW + PAD_X * 2;
+    uint16_t badgeH = contentH + PAD_Y * 2;
+
+    // Position: top-right by default, top-left if metadata occupies top-right
+    uint16_t bx, by;
+    if (metaPos == MetaPosition::OverlayTopRight) {
+        bx = MARGIN;
+        by = MARGIN;
+    } else {
+        bx = DISPLAY_WIDTH - badgeW - MARGIN;
+        by = MARGIN;
+    }
+
+    // Draw badge background
+    drawOverlayBadge(bx, by, badgeW, badgeH);
+
+    // Draw battery outline (white rect with 1px border)
+    uint16_t iconX = bx + PAD_X;
+    uint16_t iconY = by + (badgeH - BATT_H) / 2;
+    _display->drawRect(iconX, iconY, BATT_W, BATT_H, TFT_WHITE);
+
+    // Draw nub on right side of battery
+    uint16_t nubX = iconX + BATT_W;
+    uint16_t nubY = iconY + (BATT_H - NUB_H) / 2;
+    _display->fillRect(nubX, nubY, NUB_W, NUB_H, TFT_WHITE);
+
+    // Draw fill level inside battery (1px inset)
+    uint16_t fillMaxW = BATT_W - 2;
+    uint16_t fillW = (fillMaxW * percent) / 100;
+    if (fillW > 0) {
+        _display->fillRect(iconX + 1, iconY + 1, fillW, BATT_H - 2, TFT_WHITE);
+    }
+
+    // Draw percentage text
+    uint16_t textX = iconX + BATT_W + NUB_W + GAP;
+    _display->setTextColor(TFT_WHITE);
+    _display->setTextDatum(middle_left);
+    _display->drawString(pctText, textX, by + badgeH / 2);
+}
+
+void DisplayManager::refresh() {
+    unsigned long start = millis();
+    triggerRefresh();
+    unsigned long elapsed = millis() - start;
+    Serial.printf("[display] Refresh complete in %lu ms\n", elapsed);
+    _power->disableEPDPower();
+}
+
+void DisplayManager::triggerRefresh() {
+    // Panel_ED2208::_exec_transfer always sends the full 400x600 frame
+    // regardless of dirty region — the dirty rect only gates whether
+    // a transfer happens at all. ~30ms at 4MHz SPI, fine for photo frame.
+    _display->display();
+}
+

src/display_manager.h

@@ -0,0 +1,39 @@
+#pragma once
+
+#include <Arduino.h>
+#include <M5GFX.h>
+#include <qrcode.h>
+#include "config.h"
+#include "image_pipeline.h"
+#include "immich_client.h"
+#include "settings.h"
+
+class PowerManager;
+
+class DisplayManager {
+public:
+    void begin(PowerManager& power);
+    void showSetupScreen();
+    void showImage(const ProcessedImage& img);
+    void showMessage(const char* title, const char* body);
+    void showMetadata(const AssetInfo& info, uint8_t metaFlags, MetaPosition pos,
+                      const String& dateFmt = "%Y-%m-%d", const String& timeFmt = "%H:%M:%S");
+    void showMetadataInRegion(const AssetInfo& info, uint8_t metaFlags, MetaPosition pos,
+                              uint16_t regionX, uint16_t regionY, uint16_t regionW, uint16_t regionH,
+                              const String& dateFmt = "%Y-%m-%d", const String& timeFmt = "%H:%M:%S");
+    void showSleepIndicator(MetaPosition metaPos);
+    void showBatteryIndicator(uint8_t percent, MetaPosition metaPos);
+    void refresh();
+
+    void setTranslucent(bool enabled) { _translucent = enabled; }
+
+private:
+    PowerManager* _power = nullptr;
+    M5GFX* _display = nullptr;
+    bool _translucent = false;
+
+    void drawOverlayBadge(uint16_t x, uint16_t y, uint16_t w, uint16_t h);
+    void drawPinIcon(int32_t x, int32_t y, int32_t size);
+    void drawCalendarIcon(int32_t x, int32_t y, int32_t size);
+    void triggerRefresh();
+};

src/image_pipeline.cpp

@@ -0,0 +1,975 @@
+#include "image_pipeline.h"
+#include "blue_noise.h"
+#include "stb_image.h"
+#include <M5GFX.h>
+#include <esp_heap_caps.h>
+#include <cstring>
+#include <cmath>
+
+// Spectra 6 calibrated palette (measured display appearance from epdoptimize)
+// These represent what the display ACTUALLY shows, used for dithering decisions
+static const uint8_t PALETTE_CALIBRATED[6][3] = {
+    {0x1F, 0x22, 0x26},  // Black  -> appears as dark gray
+    {0xB9, 0xC7, 0xC9},  // White  -> appears as light gray-blue
+    {0x62, 0x20, 0x1E},  // Red    -> appears as dark red/brown
+    {0x35, 0x56, 0x3A},  // Green  -> appears as dark forest green
+    {0x23, 0x3F, 0x8E},  // Blue   -> appears as dark navy
+    {0xC1, 0xBB, 0x1E}   // Yellow -> appears as olive/mustard
+};
+
+// ---------------------------------------------------------------------------
+// Color science helpers (sRGB <-> LAB, luma, saturation)
+// ---------------------------------------------------------------------------
+
+static inline uint8_t clampByte(float v) {
+    if (v <= 0.0f) return 0;
+    if (v >= 255.0f) return 255;
+    return (uint8_t)(v + 0.5f);
+}
+
+static inline float clampF(float v, float lo, float hi) {
+    return (v < lo) ? lo : (v > hi) ? hi : v;
+}
+
+static inline float luma709(float r, float g, float b) {
+    return 0.2126f * r + 0.7152f * g + 0.0722f * b;
+}
+
+// Pre-computed sRGB-to-linear LUT (avoids per-pixel powf)
+static const float* getSrgbToLinear() {
+    static float lut[256];
+    static bool initialized = false;
+    if (!initialized) {
+        for (int i = 0; i < 256; i++) {
+            float n = i / 255.0f;
+            lut[i] = (n > 0.04045f)
+                ? powf((n + 0.055f) / 1.055f, 2.4f)
+                : n / 12.92f;
+        }
+        initialized = true;
+    }
+    return lut;
+}
+
+static inline float labForwardPivot(float v) {
+    return (v > 0.008856f) ? cbrtf(v) : 7.787f * v + 16.0f / 116.0f;
+}
+
+// Lightness-only conversion (for DRC histogram pass)
+static float rgbToLabLightness(uint8_t r, uint8_t g, uint8_t b) {
+    const float* lut = getSrgbToLinear();
+    float y = lut[r] * 0.2126729f + lut[g] * 0.7151522f + lut[b] * 0.0721750f;
+    return 116.0f * labForwardPivot(y) - 16.0f;
+}
+
+// Full sRGB -> CIE LAB (D65 illuminant)
+static void srgbToLab(uint8_t r, uint8_t g, uint8_t b,
+                      float* L, float* a, float* bOut) {
+    const float* lut = getSrgbToLinear();
+    float rn = lut[r], gn = lut[g], bn = lut[b];
+
+    float x = rn * 0.4124564f + gn * 0.3575761f + bn * 0.1804375f;
+    float y = rn * 0.2126729f + gn * 0.7151522f + bn * 0.0721750f;
+    float z = rn * 0.0193339f + gn * 0.1191920f + bn * 0.9503041f;
+
+    float fx = labForwardPivot(x / 0.95047f);
+    float fy = labForwardPivot(y);
+    float fz = labForwardPivot(z / 1.08883f);
+
+    *L    = 116.0f * fy - 16.0f;
+    *a    = 500.0f * (fx - fy);
+    *bOut = 200.0f * (fy - fz);
+}
+
+// CIE LAB -> sRGB (D65 illuminant)
+static void labToSrgb(float L, float a, float b,
+                      uint8_t* rOut, uint8_t* gOut, uint8_t* bOut) {
+    float fy = (L + 16.0f) / 116.0f;
+    float fx = a / 500.0f + fy;
+    float fz = fy - b / 200.0f;
+
+    float x = (fx > 0.206897f) ? fx * fx * fx : (fx - 16.0f / 116.0f) / 7.787f;
+    float y = (fy > 0.206897f) ? fy * fy * fy : (fy - 16.0f / 116.0f) / 7.787f;
+    float z = (fz > 0.206897f) ? fz * fz * fz : (fz - 16.0f / 116.0f) / 7.787f;
+
+    x *= 0.95047f;
+    z *= 1.08883f;
+
+    float rl = x *  3.2404542f + y * -1.5371385f + z * -0.4985314f;
+    float gl = x * -0.9692660f + y *  1.8760108f + z *  0.0415560f;
+    float bl = x *  0.0556434f + y * -0.2040259f + z *  1.0572252f;
+
+    auto linearToSrgb = [](float v) -> float {
+        if (v <= 0.0f) return 0.0f;
+        return (v > 0.0031308f)
+            ? 1.055f * powf(v, 1.0f / 2.4f) - 0.055f
+            : 12.92f * v;
+    };
+
+    *rOut = clampByte(linearToSrgb(rl) * 255.0f);
+    *gOut = clampByte(linearToSrgb(gl) * 255.0f);
+    *bOut = clampByte(linearToSrgb(bl) * 255.0f);
+}
+
+// HSV-style saturation (max-min)/max in 0..1 range
+static inline float pixelSaturation(float r, float g, float b) {
+    float mx = fmaxf(r, fmaxf(g, b));
+    float mn = fminf(r, fminf(g, b));
+    return (mx > 0.0f) ? (mx - mn) / mx : 0.0f;
+}
+
+// ---------------------------------------------------------------------------
+// Tone mapping (replaces enhanceContrast)
+//
+// Uses epdoptimize's "dynamic" preset:
+//   - Asymmetric power-curve S-curve built into a 256-entry LUT
+//   - HSL-space saturation adjustment (preserves hue fidelity)
+//   - Lookup-table contrast and exposure
+// ---------------------------------------------------------------------------
+
+static constexpr float SHADOW_TONE_RESPONSE = 1.5f;
+
+static void toneMap(uint8_t* rgb, size_t pixelCount) {
+    static constexpr float EXPOSURE       = 0.0f;   // stops (2^0 = 1.0x)
+    static constexpr float SATURATION_ADJ = 0.3f;   // -> 1.3x multiplier
+    static constexpr float CONTRAST_ADJ   = 0.0f;   // -> 1.0x multiplier
+    static constexpr float STRENGTH       = 0.9f;
+    static constexpr float SHADOW_BOOST   = 0.0f;
+    static constexpr float HIGHLIGHT_COMP = -1.5f;
+    static constexpr float MIDPOINT       = 0.5f;
+
+    float exposureMul  = powf(2.0f, EXPOSURE);
+    float satMul       = fmaxf(0.0f, SATURATION_ADJ + 1.0f);
+    float contrastMul  = (CONTRAST_ADJ < 0.0f)
+                       ? fmaxf(0.5f, 1.0f + CONTRAST_ADJ * 0.5f)
+                       : CONTRAST_ADJ + 1.0f;
+
+    // Build S-curve LUT (asymmetric power curve per epdoptimize)
+    float mid = clampF(MIDPOINT, 0.01f, 0.99f);
+    float shadowExp    = clampF(1.0f - STRENGTH * SHADOW_BOOST * SHADOW_TONE_RESPONSE, 0.15f, 3.0f);
+    float highlightExp = clampF(1.0f - STRENGTH * HIGHLIGHT_COMP, 0.15f, 3.0f);
+
+    uint8_t exposureLut[256];
+    uint8_t toneLut[256];
+
+    for (int v = 0; v < 256; v++) {
+        exposureLut[v] = clampByte((float)v * exposureMul);
+
+        float tv = clampF(((float)v - 128.0f) * contrastMul + 128.0f, 0.0f, 255.0f);
+
+        if (STRENGTH != 0.0f) {
+            float n = tv / 255.0f;
+            float curved;
+            if (n <= mid) {
+                curved = powf(n / mid, shadowExp) * mid;
+            } else {
+                curved = mid + powf((n - mid) / (1.0f - mid), highlightExp) * (1.0f - mid);
+            }
+            tv = clampF(curved * 255.0f, 0.0f, 255.0f);
+        }
+        toneLut[v] = (uint8_t)tv;
+    }
+
+    bool needsSaturation = (satMul != 1.0f);
+
+    for (size_t i = 0; i < pixelCount; i++) {
+        size_t idx = i * 3;
+
+        if (!needsSaturation) {
+            rgb[idx]     = toneLut[exposureLut[rgb[idx]]];
+            rgb[idx + 1] = toneLut[exposureLut[rgb[idx + 1]]];
+            rgb[idx + 2] = toneLut[exposureLut[rgb[idx + 2]]];
+            continue;
+        }
+
+        // HSL-space saturation (preserves hue, matches epdoptimize)
+        float r0 = exposureLut[rgb[idx]]     / 255.0f;
+        float g0 = exposureLut[rgb[idx + 1]] / 255.0f;
+        float b0 = exposureLut[rgb[idx + 2]] / 255.0f;
+
+        float maxC = fmaxf(r0, fmaxf(g0, b0));
+        float minC = fminf(r0, fminf(g0, b0));
+        float light = (maxC + minC) * 0.5f;
+        float r = r0, g = g0, b = b0;
+
+        if (maxC != minC) {
+            float delta = maxC - minC;
+            float sat = (light > 0.5f)
+                ? delta / (2.0f - maxC - minC)
+                : delta / fmaxf(maxC + minC, 1e-6f);
+
+            float hue;
+            if (maxC == r0) {
+                hue = (g0 - b0) / delta;
+                if (g0 < b0) hue += 6.0f;
+                hue /= 6.0f;
+            } else if (maxC == g0) {
+                hue = ((b0 - r0) / delta + 2.0f) / 6.0f;
+            } else {
+                hue = ((r0 - g0) / delta + 4.0f) / 6.0f;
+            }
+
+            float newSat = clampF(sat * satMul, 0.0f, 1.0f);
+            float c = (1.0f - fabsf(2.0f * light - 1.0f)) * newSat;
+            float x = c * (1.0f - fabsf(fmodf(hue * 6.0f, 2.0f) - 1.0f));
+            float m = light - c * 0.5f;
+
+            int sector = (int)(hue * 6.0f);
+            if (sector >= 6) sector = 5;
+            switch (sector) {
+                case 0:  r = c + m; g = x + m; b = m;     break;
+                case 1:  r = x + m; g = c + m; b = m;     break;
+                case 2:  r = m;     g = c + m; b = x + m; break;
+                case 3:  r = m;     g = x + m; b = c + m; break;
+                case 4:  r = x + m; g = m;     b = c + m; break;
+                case 5:  r = c + m; g = m;     b = x + m; break;
+            }
+        }
+
+        rgb[idx]     = toneLut[clampByte(r * 255.0f)];
+        rgb[idx + 1] = toneLut[clampByte(g * 255.0f)];
+        rgb[idx + 2] = toneLut[clampByte(b * 255.0f)];
+    }
+
+    Serial.printf("[pipeline] toneMap: exposure=%.1f sat=%.1fx strength=%.1f\n",
+                  EXPOSURE, satMul, STRENGTH);
+}
+
+// ---------------------------------------------------------------------------
+// Dynamic range compression (fast luma path with chroma protection)
+//
+// Uses epdoptimize's "balanced" preset approach:
+//   - Histogram percentile scan for source range detection
+//   - Remap into palette luminance range
+//   - smoothstep chroma protection prevents saturated color washout
+// ---------------------------------------------------------------------------
+
+static void compressDynamicRange(uint8_t* rgb, size_t pixelCount) {
+    static constexpr float STRENGTH        = 1.0f;
+    static constexpr float LOW_PERCENTILE  = 0.01f;
+    static constexpr float HIGH_PERCENTILE = 0.99f;
+
+    float blackY = luma709(PALETTE_CALIBRATED[0][0],
+                           PALETTE_CALIBRATED[0][1],
+                           PALETTE_CALIBRATED[0][2]);
+    float whiteY = luma709(PALETTE_CALIBRATED[1][0],
+                           PALETTE_CALIBRATED[1][1],
+                           PALETTE_CALIBRATED[1][2]);
+    float targetRange = whiteY - blackY;
+    if (targetRange <= 0.0f) return;
+
+    // Build luma histogram for percentile detection
+    uint32_t histogram[256] = {0};
+    for (size_t i = 0; i < pixelCount; i++) {
+        size_t idx = i * 3;
+        histogram[clampByte(luma709(rgb[idx], rgb[idx + 1], rgb[idx + 2]))]++;
+    }
+
+    // Find percentile endpoints
+    auto findPercentile = [&](float p) -> float {
+        uint32_t target = (uint32_t)((pixelCount - 1) * p);
+        uint32_t seen = 0;
+        for (int i = 0; i < 256; i++) {
+            seen += histogram[i];
+            if (seen > target) return (float)i;
+        }
+        return 255.0f;
+    };
+
+    float sourceBlackY = findPercentile(LOW_PERCENTILE);
+    float sourceWhiteY = findPercentile(HIGH_PERCENTILE);
+    float sourceRange  = sourceWhiteY - sourceBlackY;
+    if (sourceRange <= 0.0001f) return;
+
+    for (size_t i = 0; i < pixelCount; i++) {
+        size_t idx = i * 3;
+        float r = rgb[idx], g = rgb[idx + 1], b = rgb[idx + 2];
+        float y = luma709(r, g, b);
+
+        float normalizedY = clampF((y - sourceBlackY) / sourceRange, 0.0f, 1.0f);
+        float targetY     = blackY + normalizedY * targetRange;
+
+        // Chroma protection: smoothstep(0.18, 0.68, saturation) * 0.85
+        float sat = pixelSaturation(r, g, b);
+        float chromaProtection = 0.0f;
+        if (sat > 0.18f) {
+            float t = clampF((sat - 0.18f) / (0.68f - 0.18f), 0.0f, 1.0f);
+            chromaProtection = t * t * (3.0f - 2.0f * t) * 0.85f;
+        }
+        float effectiveStrength = STRENGTH * (1.0f - chromaProtection);
+
+        float nextY = y + (targetY - y) * effectiveStrength;
+        float ratio = (y > 0.0f) ? nextY / y : 0.0f;
+        float maxChannel = fmaxf(r, fmaxf(g, b));
+        if (maxChannel > 0.0f) ratio = fminf(ratio, 255.0f / maxChannel);
+
+        rgb[idx]     = clampByte(r * ratio);
+        rgb[idx + 1] = clampByte(g * ratio);
+        rgb[idx + 2] = clampByte(b * ratio);
+    }
+
+    Serial.printf("[pipeline] DRC: src=[%.0f..%.0f] -> dst=[%.0f..%.0f]\n",
+                  sourceBlackY, sourceWhiteY, blackY, whiteY);
+}
+
+
+// Average a single edge of the fitted image (4 rows or columns deep)
+static constexpr int EDGE_DEPTH = 4;
+
+struct EdgeColor { uint8_t r, g, b; };
+
+static EdgeColor averageEdge(const uint8_t* rgb, uint16_t w, uint16_t h,
+                             int side) {
+    // side: 0=top, 1=bottom, 2=left, 3=right
+    uint32_t sumR = 0, sumG = 0, sumB = 0, count = 0;
+
+    switch (side) {
+        case 0: { // top rows
+            int rows = min((int)h, EDGE_DEPTH);
+            for (int y = 0; y < rows; y++)
+                for (int x = 0; x < w; x++) {
+                    size_t idx = ((size_t)y * w + x) * 3;
+                    sumR += rgb[idx]; sumG += rgb[idx+1]; sumB += rgb[idx+2]; count++;
+                }
+            break;
+        }
+        case 1: { // bottom rows
+            int rows = min((int)h, EDGE_DEPTH);
+            for (int y = h - rows; y < h; y++)
+                for (int x = 0; x < w; x++) {
+                    size_t idx = ((size_t)y * w + x) * 3;
+                    sumR += rgb[idx]; sumG += rgb[idx+1]; sumB += rgb[idx+2]; count++;
+                }
+            break;
+        }
+        case 2: { // left columns
+            int cols = min((int)w, EDGE_DEPTH);
+            for (int y = 0; y < h; y++)
+                for (int x = 0; x < cols; x++) {
+                    size_t idx = ((size_t)y * w + x) * 3;
+                    sumR += rgb[idx]; sumG += rgb[idx+1]; sumB += rgb[idx+2]; count++;
+                }
+            break;
+        }
+        case 3: { // right columns
+            int cols = min((int)w, EDGE_DEPTH);
+            for (int y = 0; y < h; y++)
+                for (int x = w - cols; x < w; x++) {
+                    size_t idx = ((size_t)y * w + x) * 3;
+                    sumR += rgb[idx]; sumG += rgb[idx+1]; sumB += rgb[idx+2]; count++;
+                }
+            break;
+        }
+    }
+
+    if (count == 0) return {0, 0, 0};
+    return {(uint8_t)(sumR / count), (uint8_t)(sumG / count), (uint8_t)(sumB / count)};
+}
+
+// In-place horizontal box blur on a rectangular sub-region of a row-major RGB buffer.
+// Operates on rows from y0..y1-1, columns x0..x1-1, within a buffer of stride `stride` pixels.
+static void boxBlurH(uint8_t* buf, uint16_t stride,
+                     uint16_t x0, uint16_t y0, uint16_t x1, uint16_t y1, int radius) {
+    int width = x1 - x0;
+    if (width <= 0) return;
+
+    // Temp row buffer for one scanline (3 bytes per pixel)
+    uint8_t* tmp = (uint8_t*)malloc(width * 3);
+    if (tmp == nullptr) return;
+
+    int diam = radius * 2 + 1;
+
+    for (uint16_t y = y0; y < y1; y++) {
+        uint8_t* row = buf + ((size_t)y * stride + x0) * 3;
+
+        // Running sum initialization
+        int sumR = 0, sumG = 0, sumB = 0;
+        for (int i = -radius; i <= radius; i++) {
+            int xi = constrain(i, 0, width - 1);
+            sumR += row[xi * 3];
+            sumG += row[xi * 3 + 1];
+            sumB += row[xi * 3 + 2];
+        }
+        tmp[0] = sumR / diam;
+        tmp[1] = sumG / diam;
+        tmp[2] = sumB / diam;
+
+        for (int x = 1; x < width; x++) {
+            int addIdx = constrain(x + radius, 0, width - 1);
+            int remIdx = constrain(x - radius - 1, 0, width - 1);
+            sumR += row[addIdx * 3]     - row[remIdx * 3];
+            sumG += row[addIdx * 3 + 1] - row[remIdx * 3 + 1];
+            sumB += row[addIdx * 3 + 2] - row[remIdx * 3 + 2];
+            tmp[x * 3]     = sumR / diam;
+            tmp[x * 3 + 1] = sumG / diam;
+            tmp[x * 3 + 2] = sumB / diam;
+        }
+
+        memcpy(row, tmp, width * 3);
+    }
+    free(tmp);
+}
+
+// In-place vertical box blur on a rectangular sub-region.
+static void boxBlurV(uint8_t* buf, uint16_t stride,
+                     uint16_t x0, uint16_t y0, uint16_t x1, uint16_t y1, int radius) {
+    int height = y1 - y0;
+    if (height <= 0) return;
+
+    uint8_t* tmp = (uint8_t*)malloc(height * 3);
+    if (tmp == nullptr) return;
+
+    int diam = radius * 2 + 1;
+
+    for (uint16_t x = x0; x < x1; x++) {
+        // Running sum initialization
+        int sumR = 0, sumG = 0, sumB = 0;
+        for (int i = -radius; i <= radius; i++) {
+            int yi = y0 + constrain(i, 0, height - 1);
+            size_t idx = ((size_t)yi * stride + x) * 3;
+            sumR += buf[idx];
+            sumG += buf[idx + 1];
+            sumB += buf[idx + 2];
+        }
+        tmp[0] = sumR / diam;
+        tmp[1] = sumG / diam;
+        tmp[2] = sumB / diam;
+
+        for (int y = 1; y < height; y++) {
+            int addY = y0 + constrain(y + radius, 0, height - 1);
+            int remY = y0 + constrain(y - radius - 1, 0, height - 1);
+            size_t addIdx = ((size_t)addY * stride + x) * 3;
+            size_t remIdx = ((size_t)remY * stride + x) * 3;
+            sumR += buf[addIdx]     - buf[remIdx];
+            sumG += buf[addIdx + 1] - buf[remIdx + 1];
+            sumB += buf[addIdx + 2] - buf[remIdx + 2];
+            tmp[y * 3]     = sumR / diam;
+            tmp[y * 3 + 1] = sumG / diam;
+            tmp[y * 3 + 2] = sumB / diam;
+        }
+
+        // Write back
+        for (int y = 0; y < height; y++) {
+            size_t idx = ((size_t)(y0 + y) * stride + x) * 3;
+            buf[idx]     = tmp[y * 3];
+            buf[idx + 1] = tmp[y * 3 + 1];
+            buf[idx + 2] = tmp[y * 3 + 2];
+        }
+    }
+    free(tmp);
+}
+
+// 3-pass box blur (approximates Gaussian) on a sub-region
+static void gaussianBlurRegion(uint8_t* buf, uint16_t stride,
+                               uint16_t x0, uint16_t y0, uint16_t x1, uint16_t y1,
+                               int radius) {
+    for (int pass = 0; pass < 3; pass++) {
+        boxBlurH(buf, stride, x0, y0, x1, y1, radius);
+        boxBlurV(buf, stride, x0, y0, x1, y1, radius);
+    }
+}
+
+// Fill letterbox bars with mirrored + blurred + faded content from the photo edge.
+// The fitted image must already be placed in final_buf at (offsetX, offsetY).
+static void fillLetterbox(uint8_t* final_buf, uint16_t targetW, uint16_t targetH,
+                          const uint8_t* fitted, uint16_t fitW, uint16_t fitH,
+                          uint16_t offsetX, uint16_t offsetY) {
+    static constexpr int BLUR_RADIUS = 6;
+
+    if (offsetY > 0) {
+        // Horizontal bars (top and bottom)
+        EdgeColor topEdge = averageEdge(fitted, fitW, fitH, 0);
+        EdgeColor botEdge = averageEdge(fitted, fitW, fitH, 1);
+
+        // --- Extend top edge into top bar ---
+        // Every row in the bar copies from the photo's topmost row (row 0)
+        for (uint16_t y = 0; y < offsetY; y++) {
+            for (uint16_t x = 0; x < targetW; x++) {
+                int srcX = (int)x - (int)offsetX;
+                srcX = constrain(srcX, 0, (int)fitW - 1);
+                size_t srcIdx = ((size_t)0 * fitW + srcX) * 3;  // always row 0
+                size_t dstIdx = ((size_t)y * targetW + x) * 3;
+                final_buf[dstIdx]     = fitted[srcIdx];
+                final_buf[dstIdx + 1] = fitted[srcIdx + 1];
+                final_buf[dstIdx + 2] = fitted[srcIdx + 2];
+            }
+        }
+
+        // --- Extend bottom edge into bottom bar ---
+        // Every row copies from the photo's bottommost row (fitH - 1)
+        uint16_t botStart = offsetY + fitH;
+        uint16_t lastRow = fitH - 1;
+        for (uint16_t y = botStart; y < targetH; y++) {
+            for (uint16_t x = 0; x < targetW; x++) {
+                int srcX = (int)x - (int)offsetX;
+                srcX = constrain(srcX, 0, (int)fitW - 1);
+                size_t srcIdx = ((size_t)lastRow * fitW + srcX) * 3;
+                size_t dstIdx = ((size_t)y * targetW + x) * 3;
+                final_buf[dstIdx]     = fitted[srcIdx];
+                final_buf[dstIdx + 1] = fitted[srcIdx + 1];
+                final_buf[dstIdx + 2] = fitted[srcIdx + 2];
+            }
+        }
+
+        // --- Blur both bars ---
+        gaussianBlurRegion(final_buf, targetW, 0, 0, targetW, offsetY, BLUR_RADIUS);
+        gaussianBlurRegion(final_buf, targetW, 0, botStart, targetW, targetH, BLUR_RADIUS);
+
+        // --- Fade toward solid edge color ---
+        for (uint16_t y = 0; y < offsetY; y++) {
+            float alpha = (float)(offsetY - 1 - y) / (float)offsetY;  // 0 at photo, 1 at screen edge
+            for (uint16_t x = 0; x < targetW; x++) {
+                size_t idx = ((size_t)y * targetW + x) * 3;
+                final_buf[idx]     = (uint8_t)(final_buf[idx]     * (1.0f - alpha) + topEdge.r * alpha);
+                final_buf[idx + 1] = (uint8_t)(final_buf[idx + 1] * (1.0f - alpha) + topEdge.g * alpha);
+                final_buf[idx + 2] = (uint8_t)(final_buf[idx + 2] * (1.0f - alpha) + topEdge.b * alpha);
+            }
+        }
+        for (uint16_t y = botStart; y < targetH; y++) {
+            float alpha = (float)(y - botStart) / (float)(targetH - botStart);
+            for (uint16_t x = 0; x < targetW; x++) {
+                size_t idx = ((size_t)y * targetW + x) * 3;
+                final_buf[idx]     = (uint8_t)(final_buf[idx]     * (1.0f - alpha) + botEdge.r * alpha);
+                final_buf[idx + 1] = (uint8_t)(final_buf[idx + 1] * (1.0f - alpha) + botEdge.g * alpha);
+                final_buf[idx + 2] = (uint8_t)(final_buf[idx + 2] * (1.0f - alpha) + botEdge.b * alpha);
+            }
+        }
+
+        Serial.printf("[pipeline] Letterbox TB: bars %dpx, top=#%02X%02X%02X bot=#%02X%02X%02X\n",
+                      offsetY, topEdge.r, topEdge.g, topEdge.b, botEdge.r, botEdge.g, botEdge.b);
+    }
+
+    if (offsetX > 0) {
+        // Vertical bars (left and right)
+        EdgeColor leftEdge = averageEdge(fitted, fitW, fitH, 2);
+        EdgeColor rightEdge = averageEdge(fitted, fitW, fitH, 3);
+
+        // --- Extend left edge into left bar ---
+        // Every column in the bar copies from the photo's leftmost column (col 0)
+        for (uint16_t y = 0; y < targetH; y++) {
+            int srcY = (int)y - (int)offsetY;
+            srcY = constrain(srcY, 0, (int)fitH - 1);
+            size_t srcIdx = ((size_t)srcY * fitW + 0) * 3;  // always column 0
+            for (uint16_t x = 0; x < offsetX; x++) {
+                size_t dstIdx = ((size_t)y * targetW + x) * 3;
+                final_buf[dstIdx]     = fitted[srcIdx];
+                final_buf[dstIdx + 1] = fitted[srcIdx + 1];
+                final_buf[dstIdx + 2] = fitted[srcIdx + 2];
+            }
+        }
+
+        // --- Extend right edge into right bar ---
+        // Every column copies from the photo's rightmost column (fitW - 1)
+        uint16_t rightStart = offsetX + fitW;
+        uint16_t lastCol = fitW - 1;
+        for (uint16_t y = 0; y < targetH; y++) {
+            int srcY = (int)y - (int)offsetY;
+            srcY = constrain(srcY, 0, (int)fitH - 1);
+            size_t srcIdx = ((size_t)srcY * fitW + lastCol) * 3;
+            for (uint16_t x = rightStart; x < targetW; x++) {
+                size_t dstIdx = ((size_t)y * targetW + x) * 3;
+                final_buf[dstIdx]     = fitted[srcIdx];
+                final_buf[dstIdx + 1] = fitted[srcIdx + 1];
+                final_buf[dstIdx + 2] = fitted[srcIdx + 2];
+            }
+        }
+
+        // --- Blur both bars ---
+        gaussianBlurRegion(final_buf, targetW, 0, 0, offsetX, targetH, BLUR_RADIUS);
+        gaussianBlurRegion(final_buf, targetW, rightStart, 0, targetW, targetH, BLUR_RADIUS);
+
+        // --- Fade toward solid edge color ---
+        for (uint16_t y = 0; y < targetH; y++) {
+            for (uint16_t x = 0; x < offsetX; x++) {
+                float alpha = (float)(offsetX - 1 - x) / (float)offsetX;
+                size_t idx = ((size_t)y * targetW + x) * 3;
+                final_buf[idx]     = (uint8_t)(final_buf[idx]     * (1.0f - alpha) + leftEdge.r * alpha);
+                final_buf[idx + 1] = (uint8_t)(final_buf[idx + 1] * (1.0f - alpha) + leftEdge.g * alpha);
+                final_buf[idx + 2] = (uint8_t)(final_buf[idx + 2] * (1.0f - alpha) + leftEdge.b * alpha);
+            }
+            for (uint16_t x = rightStart; x < targetW; x++) {
+                float alpha = (float)(x - rightStart) / (float)(targetW - rightStart);
+                size_t idx = ((size_t)y * targetW + x) * 3;
+                final_buf[idx]     = (uint8_t)(final_buf[idx]     * (1.0f - alpha) + rightEdge.r * alpha);
+                final_buf[idx + 1] = (uint8_t)(final_buf[idx + 1] * (1.0f - alpha) + rightEdge.g * alpha);
+                final_buf[idx + 2] = (uint8_t)(final_buf[idx + 2] * (1.0f - alpha) + rightEdge.b * alpha);
+            }
+        }
+
+        Serial.printf("[pipeline] Letterbox LR: bars %dpx, left=#%02X%02X%02X right=#%02X%02X%02X\n",
+                      offsetX, leftEdge.r, leftEdge.g, leftEdge.b,
+                      rightEdge.r, rightEdge.g, rightEdge.b);
+    }
+}
+
+// Bilinear resize from src (srcW x srcH) to dst (dstW x dstH)
+static void bilinearResize(const uint8_t* src, uint16_t srcW, uint16_t srcH,
+                           uint8_t* dst, uint16_t dstW, uint16_t dstH) {
+    if (dstW <= 1 || dstH <= 1 || srcW <= 1 || srcH <= 1) return;
+
+    float xRatio = (float)(srcW - 1) / (float)(dstW - 1);
+    float yRatio = (float)(srcH - 1) / (float)(dstH - 1);
+
+    for (uint16_t y = 0; y < dstH; y++) {
+        float srcY = y * yRatio;
+        uint16_t y0 = (uint16_t)srcY;
+        uint16_t y1 = min((uint16_t)(y0 + 1), (uint16_t)(srcH - 1));
+        float yFrac = srcY - y0;
+
+        for (uint16_t x = 0; x < dstW; x++) {
+            float srcX = x * xRatio;
+            uint16_t x0 = (uint16_t)srcX;
+            uint16_t x1 = min((uint16_t)(x0 + 1), (uint16_t)(srcW - 1));
+            float xFrac = srcX - x0;
+
+            for (int c = 0; c < 3; c++) {
+                float top = src[(y0 * srcW + x0) * 3 + c] * (1 - xFrac) +
+                           src[(y0 * srcW + x1) * 3 + c] * xFrac;
+                float bot = src[(y1 * srcW + x0) * 3 + c] * (1 - xFrac) +
+                           src[(y1 * srcW + x1) * 3 + c] * xFrac;
+                float val = top * (1 - yFrac) + bot * yFrac;
+                dst[(y * dstW + x) * 3 + c] = (uint8_t)(val + 0.5f);
+            }
+        }
+    }
+}
+
+
+
+uint8_t* ImagePipeline::decodeAndFit(uint8_t* data, size_t size,
+                                      uint16_t targetW, uint16_t targetH,
+                                      uint16_t* outW, uint16_t* outH) {
+    // Decode JPEG using stb_image (handles baseline, progressive, extended sequential)
+    int imgW, imgH, channels;
+    uint8_t* decoded = stbi_load_from_memory(data, (int)size, &imgW, &imgH, &channels, 3);
+    if (decoded == nullptr) {
+        Serial.printf("[pipeline] stbi decode failed: %s\n", stbi_failure_reason());
+        return nullptr;
+    }
+
+    Serial.printf("[pipeline] JPEG: %dx%d decoded (channels=%d)\n", imgW, imgH, channels);
+
+    // Fit-contain: scale to fit entirely within target dimensions
+    float fitScaleW = (float)targetW / (float)imgW;
+    float fitScaleH = (float)targetH / (float)imgH;
+    float fitScale = fminf(fitScaleW, fitScaleH);
+    uint16_t fitW = (uint16_t)(imgW * fitScale);
+    uint16_t fitH = (uint16_t)(imgH * fitScale);
+
+    Serial.printf("[pipeline] Fit: %dx%d -> %dx%d (scale %.2f)\n",
+                  imgW, imgH, fitW, fitH, fitScale);
+
+    // Resize decoded image to fit dimensions
+    uint8_t* fitted = (uint8_t*)ps_malloc((size_t)fitW * fitH * 3);
+    if (fitted == nullptr) {
+        Serial.println("[pipeline] Fit alloc failed");
+        stbi_image_free(decoded);
+        return nullptr;
+    }
+    bilinearResize(decoded, (uint16_t)imgW, (uint16_t)imgH, fitted, fitW, fitH);
+    stbi_image_free(decoded);
+
+    // Allocate final target-sized buffer (zeroed)
+    uint8_t* final_buf = (uint8_t*)ps_calloc(targetW * targetH, 3);
+    if (final_buf == nullptr) {
+        Serial.println("[pipeline] Final buffer alloc failed");
+        free(fitted);
+        return nullptr;
+    }
+
+    // Center the fitted image into the final buffer
+    uint16_t offsetX = (targetW - fitW) / 2;
+    uint16_t offsetY = (targetH - fitH) / 2;
+    for (uint16_t y = 0; y < fitH; y++) {
+        memcpy(final_buf + ((size_t)(offsetY + y) * targetW + offsetX) * 3,
+               fitted + (size_t)y * fitW * 3,
+               fitW * 3);
+    }
+
+    // Fill letterbox bars — each bar matches the adjacent photo edge
+    fillLetterbox(final_buf, targetW, targetH, fitted, fitW, fitH, offsetX, offsetY);
+    free(fitted);
+
+    *outW = targetW;
+    *outH = targetH;
+    return final_buf;
+}
+
+ProcessedImage ImagePipeline::process(uint8_t* jpegData, size_t jpegSize) {
+    ProcessedImage result = {nullptr, DISPLAY_WIDTH, DISPLAY_HEIGHT, false};
+
+    uint16_t outW, outH;
+    uint8_t* rgb = decodeAndFit(jpegData, jpegSize, DISPLAY_WIDTH, DISPLAY_HEIGHT, &outW, &outH);
+    if (rgb == nullptr) {
+        Serial.println("[pipeline] Decode/fit failed");
+        return result;
+    }
+
+    Serial.printf("[pipeline] Got %dx%d fitted RGB\n", outW, outH);
+
+    size_t totalPixels = (size_t)outW * outH;
+    switch (_mode) {
+        case PipelineMode::DYNAMIC:
+            toneMap(rgb, totalPixels);
+            break;
+        case PipelineMode::BALANCED:
+            compressDynamicRange(rgb, totalPixels);
+            break;
+        case PipelineMode::NONE:
+            break;
+        // No default — compiler warns on unhandled PipelineMode via -Wswitch
+    }
+
+    uint8_t* dithered = ditherRowByRow(rgb, outW, outH);
+    free(rgb);
+
+    if (dithered == nullptr) {
+        return result;
+    }
+
+    result.framebuffer = dithered;
+    result.width = outW;
+    result.height = outH;
+    result.valid = true;
+    const char* modeName = (_mode == PipelineMode::DYNAMIC) ? "dynamic"
+                         : (_mode == PipelineMode::BALANCED) ? "balanced"
+                         : "none";
+    Serial.printf("[pipeline] Processing complete (%dx%d, mode=%s)\n",
+                  outW, outH, modeName);
+    return result;
+}
+
+ProcessedImage ImagePipeline::processPortraitPair(uint8_t* jpeg1Data, size_t jpeg1Size,
+                                                    uint8_t* jpeg2Data, size_t jpeg2Size) {
+    ProcessedImage result = {nullptr, DISPLAY_WIDTH, DISPLAY_HEIGHT, false};
+
+    uint16_t portraitW = (DISPLAY_WIDTH - PORTRAIT_GAP_PX) / 2;
+    uint16_t portraitH = DISPLAY_HEIGHT;
+
+    uint16_t out1W, out1H;
+    uint8_t* rgb1 = decodeAndFit(jpeg1Data, jpeg1Size, portraitW, portraitH, &out1W, &out1H);
+
+    uint16_t out2W, out2H;
+    uint8_t* rgb2 = decodeAndFit(jpeg2Data, jpeg2Size, portraitW, portraitH, &out2W, &out2H);
+
+    // Allocate combined RGB buffer
+    uint8_t* combined = (uint8_t*)ps_calloc(DISPLAY_WIDTH * DISPLAY_HEIGHT, 3);
+    if (combined == nullptr) {
+        if (rgb1) free(rgb1);
+        if (rgb2) free(rgb2);
+        return result;
+    }
+
+    if (rgb1 != nullptr) {
+        for (uint16_t y = 0; y < out1H; y++) {
+            memcpy(combined + y * DISPLAY_WIDTH * 3,
+                   rgb1 + y * out1W * 3, out1W * 3);
+        }
+        free(rgb1);
+    }
+
+    if (rgb2 != nullptr) {
+        uint16_t offsetX = portraitW + PORTRAIT_GAP_PX;
+        for (uint16_t y = 0; y < out2H; y++) {
+            memcpy(combined + (y * DISPLAY_WIDTH + offsetX) * 3,
+                   rgb2 + y * out2W * 3, out2W * 3);
+        }
+        free(rgb2);
+    }
+
+    size_t combinedPixels = (size_t)DISPLAY_WIDTH * DISPLAY_HEIGHT;
+    switch (_mode) {
+        case PipelineMode::DYNAMIC:
+            toneMap(combined, combinedPixels);
+            break;
+        case PipelineMode::BALANCED:
+            compressDynamicRange(combined, combinedPixels);
+            break;
+        case PipelineMode::NONE:
+            break;
+        // No default — compiler warns on unhandled PipelineMode via -Wswitch
+    }
+
+    uint8_t* dithered = ditherRowByRow(combined, DISPLAY_WIDTH, DISPLAY_HEIGHT);
+    free(combined);
+
+    if (dithered == nullptr) return result;
+
+    result.framebuffer = dithered;
+    result.width = DISPLAY_WIDTH;
+    result.height = DISPLAY_HEIGHT;
+    result.valid = true;
+    return result;
+}
+
+void ImagePipeline::freeImage(ProcessedImage& img) {
+    if (img.framebuffer) {
+        free(img.framebuffer);
+        img.framebuffer = nullptr;
+    }
+    img.valid = false;
+}
+
+uint8_t* ImagePipeline::ditherRowByRow(uint8_t* rgb, uint16_t width, uint16_t height) {
+    size_t pixelCount = (size_t)width * height;
+    uint8_t* output = (uint8_t*)ps_malloc(pixelCount);
+    if (output == nullptr) {
+        Serial.println("[pipeline] Dither output alloc failed");
+        return nullptr;
+    }
+
+    size_t rowBytes = (size_t)width * 3 * sizeof(int16_t);
+    int16_t* errCurrent = (int16_t*)ps_malloc(rowBytes);
+    int16_t* errNext = (int16_t*)ps_malloc(rowBytes);
+    if (errCurrent == nullptr || errNext == nullptr) {
+        Serial.println("[pipeline] Dither error buffer alloc failed");
+        free(output);
+        if (errCurrent) free(errCurrent);
+        if (errNext) free(errNext);
+        return nullptr;
+    }
+
+    // Initialize first row
+    for (uint16_t x = 0; x < width; x++) {
+        size_t srcIdx = x * 3;
+        size_t errIdx = x * 3;
+        errCurrent[errIdx]     = rgb[srcIdx];
+        errCurrent[errIdx + 1] = rgb[srcIdx + 1];
+        errCurrent[errIdx + 2] = rgb[srcIdx + 2];
+    }
+
+    for (uint16_t y = 0; y < height; y++) {
+        // Prepare next row from source
+        if (y + 1 < height) {
+            size_t nextRowOffset = (size_t)(y + 1) * width * 3;
+            for (uint16_t x = 0; x < width; x++) {
+                size_t srcIdx = nextRowOffset + x * 3;
+                size_t errIdx = x * 3;
+                errNext[errIdx]     = rgb[srcIdx];
+                errNext[errIdx + 1] = rgb[srcIdx + 1];
+                errNext[errIdx + 2] = rgb[srcIdx + 2];
+            }
+        } else {
+            memset(errNext, 0, rowBytes);
+        }
+
+        // Serpentine: alternate scan direction each row
+        bool forward = (y % 2 == 0);
+        int xStart = forward ? 0 : (int)width - 1;
+        int xEnd   = forward ? (int)width : -1;
+        int xStep  = forward ? 1 : -1;
+
+        for (int x = xStart; x != xEnd; x += xStep) {
+            size_t errIdx = (size_t)x * 3;
+
+            int r = constrain(errCurrent[errIdx], 0, 255);
+            int g = constrain(errCurrent[errIdx + 1], 0, 255);
+            int b = constrain(errCurrent[errIdx + 2], 0, 255);
+
+            uint8_t nearest = findNearest(r, g, b);
+            output[y * width + x] = nearest;
+
+            int errR = r - PALETTE_CALIBRATED[nearest][0];
+            int errG = g - PALETTE_CALIBRATED[nearest][1];
+            int errB = b - PALETTE_CALIBRATED[nearest][2];
+
+            // Floyd-Steinberg: mirror dx offsets on reverse rows
+            int xRight = forward ? x + 1 : x - 1;
+            int xLeft  = forward ? x - 1 : x + 1;
+
+            // 7/16 to next pixel in scan direction
+            if (xRight >= 0 && xRight < (int)width) {
+                size_t ni = (size_t)xRight * 3;
+                errCurrent[ni]     += errR * 7 / 16;
+                errCurrent[ni + 1] += errG * 7 / 16;
+                errCurrent[ni + 2] += errB * 7 / 16;
+            }
+
+            if (y + 1 < height) {
+                if (_blueNoise) {
+                    // Randomized error scatter: the diagonal pattern is caused
+                    // by the 5/16 "below" weight always landing error on the
+                    // same column, creating vertical correlation that manifests
+                    // as diagonal lines. We break this by randomly offsetting
+                    // the entire below-row error target by -2..+2 pixels.
+                    // Energy is perfectly conserved (same 9/16 total, same
+                    // 3/5/1 ratio — just shifted horizontally).
+                    uint32_t h = (uint32_t)x * 2654435761u
+                               ^ (uint32_t)y * 2246822519u;
+                    int offset = (int)(h % 5u) - 2;  // -2, -1, 0, +1, or +2
+
+                    int xBL = xLeft + offset;
+                    int xB  = x + offset;
+                    int xBR = xRight + offset;
+
+                    // 3/16 to below-left (shifted)
+                    if (xBL >= 0 && xBL < (int)width) {
+                        size_t ni = (size_t)xBL * 3;
+                        errNext[ni]     += errR * 3 / 16;
+                        errNext[ni + 1] += errG * 3 / 16;
+                        errNext[ni + 2] += errB * 3 / 16;
+                    }
+                    // 5/16 to below (shifted)
+                    if (xB >= 0 && xB < (int)width) {
+                        size_t ni = (size_t)xB * 3;
+                        errNext[ni]     += errR * 5 / 16;
+                        errNext[ni + 1] += errG * 5 / 16;
+                        errNext[ni + 2] += errB * 5 / 16;
+                    }
+                    // 1/16 to below-right (shifted)
+                    if (xBR >= 0 && xBR < (int)width) {
+                        size_t ni = (size_t)xBR * 3;
+                        errNext[ni]     += errR * 1 / 16;
+                        errNext[ni + 1] += errG * 1 / 16;
+                        errNext[ni + 2] += errB * 1 / 16;
+                    }
+                } else {
+                    // Standard fixed Floyd-Steinberg weights
+                    if (xLeft >= 0 && xLeft < (int)width) {
+                        size_t ni = (size_t)xLeft * 3;
+                        errNext[ni]     += errR * 3 / 16;
+                        errNext[ni + 1] += errG * 3 / 16;
+                        errNext[ni + 2] += errB * 3 / 16;
+                    }
+                    {
+                        size_t ni = (size_t)x * 3;
+                        errNext[ni]     += errR * 5 / 16;
+                        errNext[ni + 1] += errG * 5 / 16;
+                        errNext[ni + 2] += errB * 5 / 16;
+                    }
+                    if (xRight >= 0 && xRight < (int)width) {
+                        size_t ni = (size_t)xRight * 3;
+                        errNext[ni]     += errR * 1 / 16;
+                        errNext[ni + 1] += errG * 1 / 16;
+                        errNext[ni + 2] += errB * 1 / 16;
+                    }
+                }
+            }
+        }
+
+        int16_t* tmp = errCurrent;
+        errCurrent = errNext;
+        errNext = tmp;
+    }
+
+    free(errCurrent);
+    free(errNext);
+    return output;
+}
+
+uint8_t ImagePipeline::findNearest(int r, int g, int b) {
+    uint8_t best = 0;
+    int32_t bestDist = INT32_MAX;
+    for (int i = 0; i < DISPLAY_COLORS; i++) {
+        int dr = r - PALETTE_CALIBRATED[i][0];
+        int dg = g - PALETTE_CALIBRATED[i][1];
+        int db = b - PALETTE_CALIBRATED[i][2];
+        // Rec. 709 luminance-weighted distance (integer weights x10000)
+        int32_t dist = 2126 * dr * dr + 7152 * dg * dg + 722 * db * db;
+        if (dist < bestDist) {
+            bestDist = dist;
+            best = static_cast<uint8_t>(i);
+        }
+    }
+    return best;
+}

src/image_pipeline.h

@@ -0,0 +1,51 @@
+#pragma once
+
+#include <Arduino.h>
+#include "config.h"
+
+struct ProcessedImage {
+    uint8_t* framebuffer;  // Palette indices, one byte per pixel
+    uint16_t width;
+    uint16_t height;
+    bool valid;
+};
+
+// Pipeline processing mode (epdoptimize recommends one or the other, not both)
+enum class PipelineMode : uint8_t {
+    DYNAMIC,   // S-curve tone mapping + saturation boost, no DRC
+    BALANCED,  // Dynamic range compression only, no tone mapping
+    NONE       // No pre-processing, straight to dither
+};
+
+class ImagePipeline {
+public:
+    // Process single landscape photo (fit-contain with edge-color letterbox)
+    ProcessedImage process(uint8_t* jpegData, size_t jpegSize);
+
+    // Process portrait pair (two photos side by side)
+    ProcessedImage processPortraitPair(uint8_t* jpeg1Data, size_t jpeg1Size,
+                                        uint8_t* jpeg2Data, size_t jpeg2Size);
+
+    void freeImage(ProcessedImage& img);
+
+    void setPipelineMode(PipelineMode mode) { _mode = mode; }
+    PipelineMode getPipelineMode() const { return _mode; }
+
+    void setBlueNoiseEnabled(bool enabled) { _blueNoise = enabled; }
+    bool getBlueNoiseEnabled() const { return _blueNoise; }
+
+private:
+    PipelineMode _mode = PipelineMode::DYNAMIC;
+    bool _blueNoise = true;
+
+    // Decode JPEG and fit into target dimensions with letterboxing
+    uint8_t* decodeAndFit(uint8_t* data, size_t size,
+                          uint16_t targetW, uint16_t targetH,
+                          uint16_t* outW, uint16_t* outH);
+
+    // Serpentine Floyd-Steinberg dither RGB888 to 6-color palette indices
+    uint8_t* ditherRowByRow(uint8_t* rgb, uint16_t width, uint16_t height);
+
+    // Find nearest palette color (Rec. 709 luminance-weighted RGB distance)
+    uint8_t findNearest(int r, int g, int b);
+};

src/immich_client.cpp

@@ -0,0 +1,601 @@
+#include "immich_client.h"
+#include <HTTPClient.h>
+#include <WiFiClientSecure.h>
+#include <ArduinoJson.h>
+#include <esp_heap_caps.h>
+
+void ImmichClient::begin(const String& baseUrl, const String& apiKey) {
+    _baseUrl = baseUrl;
+    // Remove trailing slash if present
+    if (_baseUrl.endsWith("/")) {
+        _baseUrl.remove(_baseUrl.length() - 1);
+    }
+    _apiKey = apiKey;
+
+    // Debug: show masked key so we can verify it's non-empty and correct prefix
+    String maskedKey = _apiKey.length() > 8
+        ? _apiKey.substring(0, 8) + "..."
+        : (_apiKey.length() > 0 ? "***" : "(empty)");
+    Serial.printf("[immich] Configured: %s | key: %s (len=%d)\n",
+                  _baseUrl.c_str(), maskedKey.c_str(), _apiKey.length());
+}
+
+std::vector<AlbumInfo> ImmichClient::fetchAlbums() {
+    std::vector<AlbumInfo> albums;
+    String url = buildUrl("/api/albums");
+    String response = httpGet(url);
+
+    if (response.isEmpty()) {
+        Serial.println("[immich] fetchAlbums: empty response");
+        return albums;
+    }
+
+    JsonDocument doc;
+    DeserializationError err = deserializeJson(doc, response);
+    if (err) {
+        Serial.printf("[immich] fetchAlbums JSON error: %s\n", err.c_str());
+        return albums;
+    }
+
+    JsonArray arr = doc.as<JsonArray>();
+    for (JsonObject obj : arr) {
+        AlbumInfo album;
+        album.id = obj["id"].as<String>();
+        album.title = obj["albumName"].as<String>();
+        album.assetCount = obj["assetCount"] | 0;
+        albums.push_back(album);
+    }
+
+    Serial.printf("[immich] Fetched %d albums\n", albums.size());
+    return albums;
+}
+
+std::vector<String> ImmichClient::fetchAlbumAssetIds(const String& albumId) {
+    std::vector<String> ids;
+    String url = buildUrl("/api/albums/" + albumId);
+
+    // Album responses can be very large (full asset metadata per photo).
+    // Use PSRAM-backed fetch to avoid exhausting regular heap.
+    size_t responseLen = 0;
+    char* response = httpGetPsram(url, &responseLen);
+    if (response == nullptr || responseLen == 0) {
+        Serial.printf("[immich] Album %s: empty response\n", albumId.c_str());
+        if (response) free(response);
+        return ids;
+    }
+
+    Serial.printf("[immich] Album %s: response %d bytes\n", albumId.c_str(), responseLen);
+
+    JsonDocument doc;
+    DeserializationError err = deserializeJson(doc, response, responseLen);
+    free(response);  // Free PSRAM buffer immediately after parsing
+
+    if (err) {
+        Serial.printf("[immich] fetchAlbumAssets JSON error: %s\n", err.c_str());
+        return ids;
+    }
+
+    JsonArray assets = doc["assets"].as<JsonArray>();
+    for (JsonObject asset : assets) {
+        String id = asset["id"].as<String>();
+        if (id.length() > 0) {
+            ids.push_back(id);
+        }
+    }
+
+    Serial.printf("[immich] Album %s: %d assets\n", albumId.c_str(), ids.size());
+    return ids;
+}
+
+std::vector<String> ImmichClient::fetchRandomAssetIds(int count,
+                                                       const std::vector<String>& albumIds) {
+    std::vector<String> ids;
+    String url = buildUrl("/api/search/random");
+
+    JsonDocument reqDoc;
+    reqDoc["size"] = count;
+    reqDoc["type"] = "IMAGE";
+    if (!albumIds.empty()) {
+        JsonArray arr = reqDoc["albumIds"].to<JsonArray>();
+        for (auto& id : albumIds) arr.add(id);
+    }
+    String body;
+    serializeJson(reqDoc, body);
+
+    String response = httpPost(url, body);
+
+    if (response.isEmpty()) {
+        Serial.println("[immich] fetchRandom: empty response");
+        return ids;
+    }
+
+    JsonDocument doc;
+    DeserializationError err = deserializeJson(doc, response);
+    if (err) {
+        Serial.printf("[immich] fetchRandom JSON error: %s\n", err.c_str());
+        return ids;
+    }
+
+    JsonArray arr = doc.as<JsonArray>();
+    int skippedRaw = 0;
+    for (JsonObject asset : arr) {
+        String id = asset["id"].as<String>();
+        if (id.length() == 0) continue;
+
+        String filename = asset["originalFileName"] | "";
+        filename.toLowerCase();
+        if (filename.endsWith(".dng") || filename.endsWith(".raw") ||
+            filename.endsWith(".cr2") || filename.endsWith(".cr3") ||
+            filename.endsWith(".nef") || filename.endsWith(".arw") ||
+            filename.endsWith(".orf") || filename.endsWith(".rw2") ||
+            filename.endsWith(".raf") || filename.endsWith(".srw")) {
+            skippedRaw++;
+            continue;
+        }
+
+        ids.push_back(id);
+    }
+
+    Serial.printf("[immich] Fetched %d random assets%s (skipped %d RAW)\n",
+                  ids.size(), albumIds.empty() ? "" : " from albums", skippedRaw);
+    return ids;
+}
+
+std::vector<RandomAsset> ImmichClient::fetchRandomAssets(int count,
+                                                          const std::vector<String>& albumIds) {
+    std::vector<RandomAsset> assets;
+    String url = buildUrl("/api/search/random");
+
+    JsonDocument reqDoc;
+    reqDoc["size"] = count;
+    reqDoc["type"] = "IMAGE";
+    if (!albumIds.empty()) {
+        JsonArray albumArr = reqDoc["albumIds"].to<JsonArray>();
+        for (auto& aid : albumIds) albumArr.add(aid);
+    }
+    String body;
+    serializeJson(reqDoc, body);
+
+    String response = httpPost(url, body);
+    if (response.isEmpty()) return assets;
+
+    JsonDocument doc;
+    DeserializationError err = deserializeJson(doc, response);
+    if (err) return assets;
+
+    JsonArray arr = doc.as<JsonArray>();
+    int skippedRaw = 0;
+    for (JsonObject asset : arr) {
+        String id = asset["id"].as<String>();
+        if (id.length() == 0) continue;
+
+        String filename = asset["originalFileName"] | "";
+        filename.toLowerCase();
+        if (filename.endsWith(".dng") || filename.endsWith(".raw") ||
+            filename.endsWith(".cr2") || filename.endsWith(".cr3") ||
+            filename.endsWith(".nef") || filename.endsWith(".arw") ||
+            filename.endsWith(".orf") || filename.endsWith(".rw2") ||
+            filename.endsWith(".raf") || filename.endsWith(".srw")) {
+            skippedRaw++;
+            continue;
+        }
+
+        RandomAsset ra;
+        ra.id = id;
+        ra.dateTime = asset["localDateTime"] | "";
+        assets.push_back(ra);
+    }
+
+    Serial.printf("[immich] Fetched %d random assets with dates%s (skipped %d RAW)\n",
+                  assets.size(), albumIds.empty() ? "" : " from albums", skippedRaw);
+    return assets;
+}
+
+std::vector<String> ImmichClient::fetchFavoriteAssetIds() {
+    std::vector<String> ids;
+    String url = buildUrl("/api/assets?isFavorite=true");
+    String response = httpGet(url);
+
+    if (response.isEmpty()) return ids;
+
+    JsonDocument doc;
+    DeserializationError err = deserializeJson(doc, response);
+    if (err) return ids;
+
+    JsonArray arr = doc.as<JsonArray>();
+    for (JsonObject asset : arr) {
+        ids.push_back(asset["id"].as<String>());
+    }
+
+    Serial.printf("[immich] Favorites: %d assets\n", ids.size());
+    return ids;
+}
+
+String ImmichClient::fetchOneRandomAssetId(const RandomFetchFilter& filter) {
+    String url = buildUrl("/api/search/random");
+
+    JsonDocument reqDoc;
+    reqDoc["size"] = 1;
+    reqDoc["type"] = "IMAGE";
+
+    if (!filter.albumIds.empty()) {
+        JsonArray arr = reqDoc["albumIds"].to<JsonArray>();
+        for (auto& id : filter.albumIds) arr.add(id);
+    }
+    if (filter.favoriteOnly) {
+        reqDoc["isFavorite"] = true;
+    }
+    if (filter.takenAfter.length() > 0) {
+        reqDoc["takenAfter"] = filter.takenAfter;
+    }
+    if (filter.takenBefore.length() > 0) {
+        reqDoc["takenBefore"] = filter.takenBefore;
+    }
+
+    String body;
+    serializeJson(reqDoc, body);
+
+    Serial.printf("[immich] fetchOne: %s\n", body.c_str());
+
+    String response = httpPost(url, body);
+    if (response.isEmpty()) {
+        Serial.println("[immich] fetchOne: empty response");
+        return "";
+    }
+
+    JsonDocument doc;
+    DeserializationError err = deserializeJson(doc, response);
+    if (err) {
+        Serial.printf("[immich] fetchOne JSON error: %s\n", err.c_str());
+        return "";
+    }
+
+    JsonArray arr = doc.as<JsonArray>();
+    for (JsonObject asset : arr) {
+        String id = asset["id"].as<String>();
+        if (id.length() == 0) continue;
+
+        // Skip RAW files
+        String filename = asset["originalFileName"] | "";
+        filename.toLowerCase();
+        if (filename.endsWith(".dng") || filename.endsWith(".raw") ||
+            filename.endsWith(".cr2") || filename.endsWith(".cr3") ||
+            filename.endsWith(".nef") || filename.endsWith(".arw") ||
+            filename.endsWith(".orf") || filename.endsWith(".rw2") ||
+            filename.endsWith(".raf") || filename.endsWith(".srw")) {
+            continue;
+        }
+
+        return id;
+    }
+
+    Serial.println("[immich] fetchOne: no usable asset returned");
+    return "";
+}
+
+std::vector<String> ImmichClient::fetchFilteredBatch(const RandomFetchFilter& filter, int count) {
+    std::vector<String> results;
+    String url = buildUrl("/api/search/random");
+
+    JsonDocument reqDoc;
+    reqDoc["size"] = count;
+    reqDoc["type"] = "IMAGE";
+
+    if (!filter.albumIds.empty()) {
+        JsonArray arr = reqDoc["albumIds"].to<JsonArray>();
+        for (auto& id : filter.albumIds) arr.add(id);
+    }
+    if (filter.favoriteOnly) {
+        reqDoc["isFavorite"] = true;
+    }
+    if (filter.takenAfter.length() > 0) {
+        reqDoc["takenAfter"] = filter.takenAfter;
+    }
+    if (filter.takenBefore.length() > 0) {
+        reqDoc["takenBefore"] = filter.takenBefore;
+    }
+
+    String body;
+    serializeJson(reqDoc, body);
+
+    Serial.printf("[immich] fetchBatch(%d): %s\n", count, body.c_str());
+
+    String response = httpPost(url, body);
+    if (response.isEmpty()) {
+        Serial.println("[immich] fetchBatch: empty response");
+        return results;
+    }
+
+    JsonDocument doc;
+    DeserializationError err = deserializeJson(doc, response);
+    if (err) {
+        Serial.printf("[immich] fetchBatch JSON error: %s\n", err.c_str());
+        return results;
+    }
+
+    JsonArray arr = doc.as<JsonArray>();
+    for (JsonObject asset : arr) {
+        String id = asset["id"].as<String>();
+        if (id.length() == 0) continue;
+
+        // Skip RAW files
+        String filename = asset["originalFileName"] | "";
+        filename.toLowerCase();
+        if (filename.endsWith(".dng") || filename.endsWith(".raw") ||
+            filename.endsWith(".cr2") || filename.endsWith(".cr3") ||
+            filename.endsWith(".nef") || filename.endsWith(".arw") ||
+            filename.endsWith(".orf") || filename.endsWith(".rw2") ||
+            filename.endsWith(".raf") || filename.endsWith(".srw")) {
+            continue;
+        }
+
+        results.push_back(id);
+    }
+
+    Serial.printf("[immich] fetchBatch: got %d usable assets\n", (int)results.size());
+    return results;
+}
+
+AssetInfo ImmichClient::fetchAssetInfo(const String& assetId) {
+    AssetInfo info;
+    info.id = assetId;
+    info.isFavorite = false;
+    info.isPortrait = false;
+
+    String url = buildUrl("/api/assets/" + assetId);
+    String response = httpGet(url);
+
+    if (response.isEmpty()) return info;
+
+    JsonDocument doc;
+    DeserializationError err = deserializeJson(doc, response);
+    if (err) return info;
+
+    info.originalFileName = doc["originalFileName"] | "";
+    info.isFavorite = doc["isFavorite"] | false;
+
+    // Date
+    info.dateTime = doc["localDateTime"] | "";
+
+    // EXIF data
+    JsonObject exif = doc["exifInfo"];
+    if (!exif.isNull()) {
+        info.city = exif["city"] | "";
+        String make = exif["make"] | "";
+        String model = exif["model"] | "";
+        if (make.length() > 0 || model.length() > 0) {
+            info.camera = make + " " + model;
+            info.camera.trim();
+        }
+
+        // Portrait detection: check orientation or dimensions
+        int width = exif["exifImageWidth"] | 0;
+        int height = exif["exifImageHeight"] | 0;
+        int orientation = exif["orientation"] | 1;
+        // Orientations 5-8 mean the image is rotated 90/270 degrees
+        if (orientation >= 5 && orientation <= 8) {
+            info.isPortrait = (width > height);
+        } else {
+            info.isPortrait = (height > width);
+        }
+    }
+
+    // People
+    JsonArray people = doc["people"];
+    if (!people.isNull()) {
+        for (JsonObject person : people) {
+            String name = person["name"] | "";
+            if (name.length() > 0) {
+                info.people.push_back(name);
+            }
+        }
+    }
+
+    return info;
+}
+
+bool ImmichClient::downloadAsset(const String& assetId, ImageQuality quality,
+                                  uint8_t** outBuffer, size_t* outSize) {
+    // Always request preview size with JPEG format.
+    // Server controls actual pixel dimensions via its image config (720px baseline).
+    // The "quality" setting is kept for future use but we always use preview for now
+    // to stay within PSRAM budget.
+    (void)quality;
+    String url = buildUrl("/api/assets/" + assetId + "/thumbnail?size=preview&format=jpeg");
+
+    if (!httpGetBinary(url, outBuffer, outSize)) {
+        return false;
+    }
+
+    // Verify JPEG magic bytes (FF D8 FF)
+    if (*outSize < 3 || (*outBuffer)[0] != 0xFF ||
+        (*outBuffer)[1] != 0xD8 || (*outBuffer)[2] != 0xFF) {
+        Serial.printf("[immich] Not JPEG data (magic: %02X %02X %02X)\n",
+                      (*outBuffer)[0], (*outBuffer)[1], (*outBuffer)[2]);
+        free(*outBuffer);
+        *outBuffer = nullptr;
+        *outSize = 0;
+        return false;
+    }
+
+    return true;
+}
+
+String ImmichClient::buildUrl(const String& path) {
+    return _baseUrl + path;
+}
+
+String ImmichClient::httpGet(const String& url) {
+    WiFiClientSecure client;
+    client.setInsecure();  // Skip TLS cert verification for self-hosted
+
+    HTTPClient http;
+    http.begin(client, url);
+    http.addHeader("x-api-key", _apiKey);
+    http.setTimeout(30000);
+
+    int code = http.GET();
+    String result = "";
+
+    if (code == HTTP_CODE_OK) {
+        result = http.getString();
+    } else {
+        Serial.printf("[immich] HTTP GET %s failed: %d\n", url.c_str(), code);
+    }
+
+    http.end();
+    return result;
+}
+
+String ImmichClient::httpPost(const String& url, const String& body) {
+    WiFiClientSecure client;
+    client.setInsecure();
+
+    HTTPClient http;
+    http.begin(client, url);
+    http.addHeader("x-api-key", _apiKey);
+    http.addHeader("Content-Type", "application/json");
+    http.setTimeout(30000);
+
+    int code = http.POST(body);
+    String result = "";
+
+    if (code == HTTP_CODE_OK) {
+        result = http.getString();
+    } else {
+        Serial.printf("[immich] HTTP POST %s failed: %d\n", url.c_str(), code);
+    }
+
+    http.end();
+    return result;
+}
+
+char* ImmichClient::httpGetPsram(const String& url, size_t* outLen) {
+    *outLen = 0;
+    WiFiClientSecure client;
+    client.setInsecure();
+
+    HTTPClient http;
+    http.begin(client, url);
+    http.addHeader("x-api-key", _apiKey);
+    http.setTimeout(60000);
+
+    int code = http.GET();
+    if (code != HTTP_CODE_OK) {
+        Serial.printf("[immich] PSRAM GET %s failed: %d\n", url.c_str(), code);
+        http.end();
+        return nullptr;
+    }
+
+    int contentLength = http.getSize();
+    WiFiClient* stream = http.getStreamPtr();
+
+    // For chunked responses without Content-Length, read in chunks
+    if (contentLength <= 0) {
+        // Read incrementally into PSRAM, up to 4MB max
+        const size_t maxSize = 4 * 1024 * 1024;
+        size_t capacity = 64 * 1024;
+        char* buf = (char*)ps_malloc(capacity);
+        if (!buf) {
+            Serial.println("[immich] PSRAM alloc failed");
+            http.end();
+            return nullptr;
+        }
+        size_t total = 0;
+        while (stream->connected() || stream->available()) {
+            int avail = stream->available();
+            if (avail <= 0) { delay(1); continue; }
+            if (total + avail >= capacity) {
+                capacity = min(capacity * 2, maxSize);
+                char* newBuf = (char*)ps_realloc(buf, capacity);
+                if (!newBuf) { free(buf); http.end(); return nullptr; }
+                buf = newBuf;
+            }
+            int read = stream->readBytes(buf + total, avail);
+            total += read;
+            if (total >= maxSize) break;
+        }
+        buf[total] = '\0';
+        *outLen = total;
+        http.end();
+        return buf;
+    }
+
+    // Known content length — single PSRAM allocation
+    char* buf = (char*)ps_malloc(contentLength + 1);
+    if (!buf) {
+        Serial.printf("[immich] PSRAM alloc failed for %d bytes\n", contentLength);
+        http.end();
+        return nullptr;
+    }
+
+    size_t bytesRead = 0;
+    while (bytesRead < (size_t)contentLength && (stream->connected() || stream->available())) {
+        int avail = stream->available();
+        if (avail <= 0) { delay(1); continue; }
+        int read = stream->readBytes(buf + bytesRead, min(avail, (int)(contentLength - bytesRead)));
+        bytesRead += read;
+    }
+    buf[bytesRead] = '\0';
+    *outLen = bytesRead;
+
+    http.end();
+    return buf;
+}
+
+bool ImmichClient::httpGetBinary(const String& url, uint8_t** outBuffer, size_t* outSize) {
+    WiFiClientSecure client;
+    client.setInsecure();
+
+    HTTPClient http;
+    http.begin(client, url);
+    http.addHeader("x-api-key", _apiKey);
+    http.setTimeout(60000);
+
+    int code = http.GET();
+    if (code != HTTP_CODE_OK) {
+        Serial.printf("[immich] Binary GET failed: %d\n", code);
+        http.end();
+        return false;
+    }
+
+    int contentLength = http.getSize();
+    if (contentLength <= 0) {
+        Serial.println("[immich] Unknown content length");
+        http.end();
+        return false;
+    }
+
+    // Allocate in PSRAM
+    *outBuffer = (uint8_t*)ps_malloc(contentLength);
+    if (*outBuffer == nullptr) {
+        Serial.printf("[immich] Failed to allocate %d bytes in PSRAM\n", contentLength);
+        http.end();
+        return false;
+    }
+
+    WiFiClient* stream = http.getStreamPtr();
+    size_t bytesRead = 0;
+    while (bytesRead < (size_t)contentLength) {
+        size_t available = stream->available();
+        if (available > 0) {
+            size_t toRead = min(available, (size_t)(contentLength - bytesRead));
+            size_t read = stream->readBytes(*outBuffer + bytesRead, toRead);
+            bytesRead += read;
+        } else {
+            delay(1);
+        }
+        if (!http.connected() && bytesRead < (size_t)contentLength) {
+            Serial.println("[immich] Connection lost during download");
+            free(*outBuffer);
+            *outBuffer = nullptr;
+            http.end();
+            return false;
+        }
+    }
+
+    *outSize = bytesRead;
+    http.end();
+    Serial.printf("[immich] Downloaded %d bytes\n", bytesRead);
+    return true;
+}

src/immich_client.h

@@ -0,0 +1,61 @@
+#pragma once
+
+#include <Arduino.h>
+#include <vector>
+#include "settings.h"
+
+struct AlbumInfo {
+    String id;
+    String title;
+    int assetCount;
+};
+
+struct AssetInfo {
+    String id;
+    String originalFileName;
+    String dateTime;
+    String city;
+    String camera;
+    bool isFavorite;
+    bool isPortrait;
+    std::vector<String> people;
+};
+
+struct RandomAsset {
+    String id;
+    String dateTime;
+};
+
+struct RandomFetchFilter {
+    std::vector<String> albumIds;
+    bool favoriteOnly = false;
+    String takenAfter;   // ISO datetime, empty = no filter
+    String takenBefore;  // ISO datetime, empty = no filter
+};
+
+class ImmichClient {
+public:
+    void begin(const String& baseUrl, const String& apiKey);
+    std::vector<AlbumInfo> fetchAlbums();
+    std::vector<String> fetchAlbumAssetIds(const String& albumId);
+    std::vector<String> fetchRandomAssetIds(int count = 50,
+                                             const std::vector<String>& albumIds = {});
+    std::vector<RandomAsset> fetchRandomAssets(int count = 50,
+                                               const std::vector<String>& albumIds = {});
+    std::vector<String> fetchFavoriteAssetIds();
+    String fetchOneRandomAssetId(const RandomFetchFilter& filter);
+    std::vector<String> fetchFilteredBatch(const RandomFetchFilter& filter, int count);
+    AssetInfo fetchAssetInfo(const String& assetId);
+    bool downloadAsset(const String& assetId, ImageQuality quality,
+                       uint8_t** outBuffer, size_t* outSize);
+
+private:
+    String _baseUrl;
+    String _apiKey;
+
+    String buildUrl(const String& path);
+    String httpGet(const String& url);
+    String httpPost(const String& url, const String& body);
+    char* httpGetPsram(const String& url, size_t* outLen);
+    bool httpGetBinary(const String& url, uint8_t** outBuffer, size_t* outSize);
+};

src/main.cpp

@@ -1,26 +1,825 @@
 #include <Arduino.h>
 #include <M5Unified.h>
+#include <ArduinoJson.h>
+#include <WiFi.h>
+#include <esp_heap_caps.h>
+#include <sys/time.h>
+#include <freertos/FreeRTOS.h>
+#include <freertos/task.h>
+#include <freertos/semphr.h>
+
 #include "config.h"
+#include "settings.h"
+#include "wifi_manager.h"
+#include "power_manager.h"
+#include "button_handler.h"
+#include "immich_client.h"
+#include "photo_queue.h"
+#include "image_pipeline.h"
+#include "display_manager.h"
+#include "web_server.h"
+#include "time_utils.h"
+#include "wake_log.h"
+
+// Global instances
+SettingsManager settingsManager;
+WiFiManager wifiManager;
+PowerManager powerManager;
+ButtonHandler buttonHandler;
+ImmichClient immichClient;
+PhotoQueue photoQueue;
+ImagePipeline imagePipeline;
+DisplayManager displayManager;
+AppWebServer webServer;
+
+// Pre-rendered photo ready for instant display on next slideshow tick
+struct PendingPhoto {
+    ProcessedImage img;
+    AssetInfo info;
+    AssetInfo info2;
+    bool isPair;
+    bool ready;
+    uint32_t settingsHash;
+};
+
+static uint32_t computeSettingsHash(const Settings& s) {
+    return (uint32_t)s.pipeline_mode
+         | ((uint32_t)s.dither_noise << 8)
+         | ((uint32_t)s.img_quality << 16);
+}
+
+// Shared state
+SemaphoreHandle_t stateMutex;
+volatile bool slideshowPlaying = true;
+volatile bool refreshRequested = false;
+volatile bool randomRequested = false;
+volatile unsigned long lastRefreshTime = 0;
+PendingPhoto pending = {{nullptr, 0, 0, false}, {}, {}, false, false, 0};
+
+// Task handles
+TaskHandle_t displayTaskHandle = nullptr;
+
+// Display a ProcessedImage with metadata overlays, trigger EPD refresh, and free the framebuffer.
+// Callers provide the image, metadata info, and current settings. Returns true if displayed.
+static bool displayPhoto(ProcessedImage& img, const AssetInfo& info, const AssetInfo& info2,
+                          bool isPair, const Settings& s) {
+    if (!img.valid) return false;
+
+    if (isPair) {
+        uint16_t halfW = (DISPLAY_WIDTH - PORTRAIT_GAP_PX) / 2;
+        uint16_t rightX = halfW + PORTRAIT_GAP_PX;
+        displayManager.showImage(img);
+        if (s.meta_flags != 0) {
+            displayManager.showMetadataInRegion(
+                info, s.meta_flags, s.meta_pos,
+                0, 0, halfW, DISPLAY_HEIGHT,
+                s.date_fmt, s.time_fmt);
+            displayManager.showMetadataInRegion(
+                info2, s.meta_flags, s.meta_pos,
+                rightX, 0, halfW, DISPLAY_HEIGHT,
+                s.date_fmt, s.time_fmt);
+        }
+    } else {
+        displayManager.showImage(img);
+        if (s.meta_flags != 0) {
+            displayManager.showMetadata(info, s.meta_flags, s.meta_pos,
+                                        s.date_fmt, s.time_fmt);
+        }
+    }
+
+    if (s.show_battery) {
+        uint8_t battPct = powerManager.getBatteryPercent();
+        displayManager.showBatteryIndicator(battPct, s.meta_pos);
+    }
+
+    displayManager.refresh();
+    imagePipeline.freeImage(img);
+    return true;
+}
+
+// Fetch, download, decode, and dither one photo (or portrait pair) from the queue.
+// On success, fills out the PendingPhoto fields and returns true.
+// On failure after MAX_RETRIES attempts, returns false with pending.ready untouched.
+static bool prepareNextPhoto(PendingPhoto& out, const Settings& s, bool wantsRandom) {
+    static constexpr int MAX_RETRIES = 10;
+
+    imagePipeline.setPipelineMode(static_cast<PipelineMode>(s.pipeline_mode));
+    imagePipeline.setBlueNoiseEnabled(s.dither_noise != 0);
+
+    for (int attempt = 0; attempt < MAX_RETRIES; attempt++) {
+        String assetId = wantsRandom ? photoQueue.random() : photoQueue.next();
+        if (assetId.length() == 0) break;
+
+        Serial.printf("[prepare] Loading asset: %s (attempt %d)\n",
+                      assetId.c_str(), attempt + 1);
+
+        AssetInfo info = immichClient.fetchAssetInfo(assetId);
+
+        uint8_t* jpegBuf = nullptr;
+        size_t jpegSize = 0;
+        if (!immichClient.downloadAsset(assetId, s.img_quality, &jpegBuf, &jpegSize)
+            || jpegBuf == nullptr) {
+            Serial.println("[prepare] Download failed, trying next");
+            continue;
+        }
+
+        Serial.printf("[prepare] JPEG: %u KB, PSRAM free: %u KB\n",
+                      (unsigned)(jpegSize / 1024),
+                      (unsigned)(heap_caps_get_free_size(MALLOC_CAP_SPIRAM) / 1024));
+
+        ProcessedImage img = {nullptr, 0, 0, false};
+        AssetInfo info2 = {};
+        bool isPair = false;
+
+        if (info.isPortrait) {
+            Serial.println("[prepare] Portrait detected, searching for pair");
+            String pairId = photoQueue.findNextPortrait();
+
+            if (pairId.length() > 0) {
+                info2 = immichClient.fetchAssetInfo(pairId);
+
+                uint8_t* jpeg2Buf = nullptr;
+                size_t jpeg2Size = 0;
+                bool dl2 = immichClient.downloadAsset(
+                    pairId, s.img_quality, &jpeg2Buf, &jpeg2Size);
+
+                if (dl2 && jpeg2Buf != nullptr) {
+                    Serial.printf("[prepare] Portrait pair: %u KB + %u KB\n",
+                                  (unsigned)(jpegSize / 1024),
+                                  (unsigned)(jpeg2Size / 1024));
+                    img = imagePipeline.processPortraitPair(
+                        jpegBuf, jpegSize, jpeg2Buf, jpeg2Size);
+                    free(jpeg2Buf);
+                    isPair = img.valid;
+
+                    if (!img.valid) {
+                        Serial.println("[prepare] Pair processing failed, showing solo");
+                        img = imagePipeline.process(jpegBuf, jpegSize);
+                    }
+                } else {
+                    Serial.println("[prepare] Pair download failed, showing solo");
+                    img = imagePipeline.process(jpegBuf, jpegSize);
+                }
+            } else {
+                img = imagePipeline.process(jpegBuf, jpegSize);
+            }
+        } else {
+            img = imagePipeline.process(jpegBuf, jpegSize);
+        }
+
+        free(jpegBuf);
+
+        Serial.printf("[prepare] Post-process PSRAM free: %u KB\n",
+                      (unsigned)(heap_caps_get_free_size(MALLOC_CAP_SPIRAM) / 1024));
+
+        if (img.valid) {
+            out.img = img;
+            out.info = info;
+            out.info2 = info2;
+            out.isPair = isPair;
+            out.settingsHash = computeSettingsHash(s);
+            out.ready = true;
+            return true;
+        }
+
+        Serial.println("[prepare] Processing failed, trying next");
+    }
+
+    return false;
+}
+
+// Discard a pre-rendered pending photo, freeing its framebuffer.
+static void discardPending(PendingPhoto& p) {
+    if (p.ready && p.img.valid) {
+        Serial.println("[prerender] Discarding stale pending image");
+        imagePipeline.freeImage(p.img);
+    }
+    p.ready = false;
+}
+
+void displayTask(void* param) {
+    Serial.println("[display_task] Started on Core 1");
+
+    // Initial sync
+    if (wifiManager.isConnected()) {
+        Settings s = settingsManager.get();
+        immichClient.begin(s.immich_url, s.immich_key);
+        photoQueue.begin(immichClient, settingsManager);
+
+        if (photoQueue.sync()) {
+            Serial.printf("[display_task] Queue ready: %d photos\n", photoQueue.size());
+            if (xSemaphoreTake(stateMutex, pdMS_TO_TICKS(100)) == pdTRUE) {
+                refreshRequested = true;
+                xSemaphoreGive(stateMutex);
+            }
+        } else {
+            displayManager.showMessage("No Photos", "Select albums in web UI");
+        }
+    }
+
+    while (true) {
+        unsigned long now = millis();
+        Settings s = settingsManager.get();
+        displayManager.setTranslucent(s.meta_translucent != 0);
+        unsigned long intervalMs = s.interval_min * 60000UL;
+
+        bool shouldRefresh = false;
+        bool wantsRandom = false;
+        bool isManual = false;
+
+        if (xSemaphoreTake(stateMutex, pdMS_TO_TICKS(100)) == pdTRUE) {
+            if (refreshRequested) {
+                shouldRefresh = true;
+                isManual = true;
+                refreshRequested = false;
+            } else if (randomRequested) {
+                shouldRefresh = true;
+                wantsRandom = true;
+                isManual = true;
+                randomRequested = false;
+            } else if (slideshowPlaying && (now - lastRefreshTime >= intervalMs)) {
+                shouldRefresh = true;
+            }
+            xSemaphoreGive(stateMutex);
+        }
+
+        // Periodic re-sync (includes album change requests)
+        if (photoQueue.needsResync() && wifiManager.isConnected()) {
+            photoQueue.sync();
+            discardPending(pending);
+        }
+
+        // --- Phase 1: Display ---
+        if (shouldRefresh && photoQueue.size() > 0 && wifiManager.isConnected()) {
+            bool displayed = false;
+            uint32_t currentHash = computeSettingsHash(s);
+
+            if (!isManual && pending.ready && pending.settingsHash == currentHash) {
+                // Use pre-rendered image — instant display
+                Serial.println("[display_task] Using pre-rendered image");
+                displayed = displayPhoto(pending.img, pending.info, pending.info2,
+                                         pending.isPair, s);
+                pending.ready = false;
+            } else {
+                // Manual request, stale settings, or no pre-render available — inline pipeline
+                if (pending.ready) {
+                    if (isManual) {
+                        Serial.println("[display_task] Manual request — discarding pre-render");
+                    } else {
+                        Serial.printf("[display_task] Settings changed (0x%08X -> 0x%08X) — discarding pre-render\n",
+                                      pending.settingsHash, currentHash);
+                    }
+                    discardPending(pending);
+                } else {
+                    Serial.println("[display_task] No pre-render available — inline fallback");
+                }
+
+                imagePipeline.setPipelineMode(static_cast<PipelineMode>(s.pipeline_mode));
+                imagePipeline.setBlueNoiseEnabled(s.dither_noise != 0);
+
+                PendingPhoto inlinePhoto = {{nullptr, 0, 0, false}, {}, {}, false, false, 0};
+                if (prepareNextPhoto(inlinePhoto, s, wantsRandom)) {
+                    displayed = displayPhoto(inlinePhoto.img, inlinePhoto.info,
+                                             inlinePhoto.info2, inlinePhoto.isPair, s);
+                }
+            }
+
+            // Log display result (normal mode)
+            if (displayed) {
+                wakeLogAppend(powerManager.getBatteryPercent(), WiFi.RSSI(), 0,
+                              photoQueue.current(), "", "n/a",
+                              WakeLogResult::Ok, false);
+            }
+
+            if (xSemaphoreTake(stateMutex, pdMS_TO_TICKS(100)) == pdTRUE) {
+                lastRefreshTime = millis();
+                xSemaphoreGive(stateMutex);
+            }
+
+            // --- Phase 2: Pre-render next photo ---
+            if (displayed && photoQueue.size() > 0 && wifiManager.isConnected()) {
+                bool playing = false;
+                if (xSemaphoreTake(stateMutex, pdMS_TO_TICKS(100)) == pdTRUE) {
+                    playing = slideshowPlaying;
+                    xSemaphoreGive(stateMutex);
+                }
+
+                if (playing) {
+                    Serial.println("[prerender] Starting pre-render of next photo");
+                    Settings preS = settingsManager.get();
+                    imagePipeline.setPipelineMode(static_cast<PipelineMode>(preS.pipeline_mode));
+                    imagePipeline.setBlueNoiseEnabled(preS.dither_noise != 0);
+
+                    if (prepareNextPhoto(pending, preS, false)) {
+                        Serial.printf("[prerender] Pre-render complete, PSRAM free: %u KB\n",
+                                      (unsigned)(heap_caps_get_free_size(MALLOC_CAP_SPIRAM) / 1024));
+                    } else {
+                        Serial.println("[prerender] Pre-render failed — will fall back to inline");
+                    }
+                }
+            }
+        }
+
+        // --- Phase 2 (idle): Pre-render if we don't have one yet ---
+        if (!pending.ready && photoQueue.size() > 0 && wifiManager.isConnected()) {
+            bool playing = false;
+            if (xSemaphoreTake(stateMutex, pdMS_TO_TICKS(100)) == pdTRUE) {
+                playing = slideshowPlaying;
+                xSemaphoreGive(stateMutex);
+            }
+
+            if (playing) {
+                Serial.println("[prerender] No pending image — pre-rendering now");
+                Settings preS = settingsManager.get();
+
+                if (prepareNextPhoto(pending, preS, false)) {
+                    Serial.printf("[prerender] Pre-render complete, PSRAM free: %u KB\n",
+                                  (unsigned)(heap_caps_get_free_size(MALLOC_CAP_SPIRAM) / 1024));
+                } else {
+                    Serial.println("[prerender] Pre-render failed — will retry next loop");
+                }
+            }
+        }
+
+        // Yield — check every second
+        vTaskDelay(pdMS_TO_TICKS(1000));
+    }
+}
+
+void webActionCallback(const String& action) {
+    if (xSemaphoreTake(stateMutex, pdMS_TO_TICKS(100)) == pdTRUE) {
+        if (action == "next") {
+            refreshRequested = true;
+        } else if (action == "random") {
+            randomRequested = true;
+        } else if (action == "pause") {
+            slideshowPlaying = false;
+        } else if (action == "play") {
+            slideshowPlaying = true;
+        } else if (action == "albums_changed") {
+            photoQueue.requestSync();
+            refreshRequested = true;
+        }
+        xSemaphoreGive(stateMutex);
+    }
+}
+
+// Build a RandomFetchFilter based on the current cycle mode and probability.
+// Returns a filter with appropriate date/favorite constraints.
+static RandomFetchFilter buildTimerFilter(const Settings& s,
+                                          const std::vector<String>& albumIds) {
+    RandomFetchFilter filter;
+    filter.albumIds = albumIds;
+
+    // If system clock isn't valid, weighted/chrono modes can't work — use plain random
+    if (!hasValidTime()) {
+        Serial.println("[timer_wake] No valid time — using unfiltered random");
+        return filter;
+    }
+
+    // Probability roll: 0-99
+    int roll = random(0, 100);
+
+    switch (s.cycle_mode) {
+        case CycleMode::Random:
+            // No extra filters
+            break;
+
+        case CycleMode::Chronological:
+            if (s.timer_last_date.length() > 0) {
+                filter.takenAfter = s.timer_last_date;
+            } else {
+                filter.takenAfter = "1970-01-01T00:00:00.000Z";
+            }
+            break;
+
+        case CycleMode::ReverseChronological:
+            if (s.timer_last_date.length() > 0) {
+                filter.takenBefore = s.timer_last_date;
+            } else {
+                filter.takenBefore = isoNow();
+            }
+            break;
+
+        case CycleMode::FavoritesWeighted:
+            // 66% chance: favorites only, 33% chance: no filter
+            if (roll < 66) {
+                filter.favoriteOnly = true;
+            }
+            break;
+
+        case CycleMode::WeightedChronological:
+            // 66% chance: recent photos (last 30 days), 33% chance: no filter
+            if (roll < 66) {
+                filter.takenAfter = isoNowMinus30d();
+            }
+            break;
+
+        case CycleMode::WeightedReverseChronological:
+            // 66% chance: older photos (before 30 days ago), 33% chance: no filter
+            if (roll < 66) {
+                filter.takenBefore = isoNowMinus30d();
+            }
+            break;
+
+        default: {
+            CycleMode unreachable = s.cycle_mode;
+            (void)unreachable;
+            break;
+        }
+    }
+
+    return filter;
+}
+
+// Derive a human-readable filter name from the cycle mode and filter state.
+static String filterName(CycleMode mode, bool relaxed) {
+    if (relaxed) return "relaxed";
+    switch (mode) {
+        case CycleMode::Random:                      return "random";
+        case CycleMode::Chronological:               return "chrono";
+        case CycleMode::ReverseChronological:        return "rev_chrono";
+        case CycleMode::FavoritesWeighted:           return "fav";
+        case CycleMode::WeightedChronological:       return "recent";
+        case CycleMode::WeightedReverseChronological: return "oldest";
+        default: {
+            CycleMode unreachable = mode;
+            (void)unreachable;
+            return "unknown";
+        }
+    }
+}
+
+// Compute a simple hash of settings that affect the batch cache validity.
+static uint32_t timerCacheHash(const Settings& s) {
+    uint32_t h = 5381;
+    h = h * 33 + static_cast<uint8_t>(s.cycle_mode);
+    h = h * 33 + s.timer_batch_size;
+    for (size_t i = 0; i < s.albums_json.length(); i++) {
+        h = h * 33 + (uint8_t)s.albums_json[i];
+    }
+    return h;
+}
+
+// Parse NVS cache string: "<hash>:<id1>,<id2>,..."
+// Returns empty vector if hash doesn't match or string is empty/invalid.
+static std::vector<String> parseCacheIds(const String& raw, uint32_t expectedHash) {
+    std::vector<String> ids;
+    int colonIdx = raw.indexOf(':');
+    if (colonIdx < 1) return ids;
+
+    uint32_t storedHash = (uint32_t)strtoul(raw.substring(0, colonIdx).c_str(), nullptr, 10);
+    if (storedHash != expectedHash) {
+        Serial.println("[timer_wake] Cache hash mismatch — invalidating");
+        return ids;
+    }
+
+    String idsPart = raw.substring(colonIdx + 1);
+    if (idsPart.length() == 0) return ids;
+
+    int start = 0;
+    while (start < (int)idsPart.length()) {
+        int commaIdx = idsPart.indexOf(',', start);
+        if (commaIdx < 0) commaIdx = idsPart.length();
+        String id = idsPart.substring(start, commaIdx);
+        if (id.length() > 0) ids.push_back(id);
+        start = commaIdx + 1;
+    }
+    return ids;
+}
+
+// Serialize cache IDs back to NVS format: "<hash>:<id1>,<id2>,..."
+static String buildCacheString(uint32_t hash, const std::vector<String>& ids) {
+    String result = String(hash) + ":";
+    for (size_t i = 0; i < ids.size(); i++) {
+        if (i > 0) result += ',';
+        result += ids[i];
+    }
+    return result;
+}
+
+// Minimal boot path for RTC timer wake: fetch one photo, display, sleep again
+void timerWakeCycle() {
+    Serial.println("[timer_wake] Starting minimal wake cycle");
+
+    // Initialize wake log early (mounts LittleFS, increments boot counter)
+    wakeLogBegin();
+
+    Settings s = settingsManager.get();
+
+    // Connect WiFi (minimal — skip NTP/mDNS to save battery)
+    unsigned long wifiStart = millis();
+    wifiManager.begin(settingsManager, true);
+    uint32_t wifiMs = millis() - wifiStart;
+
+    if (!wifiManager.isConnected()) {
+        Serial.println("[timer_wake] WiFi failed — going back to sleep");
+        wakeLogAppend(powerManager.getBatteryPercent(), 0, wifiMs,
+                      "", "", "n/a", WakeLogResult::FailFetch, true);
+        powerManager.enterDeepSleep(s.interval_min);
+        return;
+    }
+
+    // Initialize Immich client and apply pipeline/display modes
+    immichClient.begin(s.immich_url, s.immich_key);
+    imagePipeline.setPipelineMode(static_cast<PipelineMode>(s.pipeline_mode));
+    imagePipeline.setBlueNoiseEnabled(s.dither_noise != 0);
+    displayManager.setTranslucent(s.meta_translucent != 0);
+
+    // Parse selected album IDs from settings
+    std::vector<String> albumIds;
+    {
+        JsonDocument doc;
+        DeserializationError err = deserializeJson(doc, s.albums_json);
+        if (!err) {
+            JsonArray arr = doc.as<JsonArray>();
+            for (JsonVariant v : arr) {
+                albumIds.push_back(v.as<String>());
+            }
+        }
+    }
+
+    // --- Batch cache logic ---
+    uint32_t cacheHash = timerCacheHash(s);
+    String cacheRaw = settingsManager.readField("timer_ids", "");
+    std::vector<String> cachedIds = parseCacheIds(cacheRaw, cacheHash);
+    bool cacheWasEmpty = cachedIds.empty();
+    bool filterRelaxed = false;
+
+    // If cache is empty, refill it with a batch fetch
+    if (cachedIds.empty()) {
+        Serial.printf("[timer_wake] Cache empty — fetching batch of %d\n", s.timer_batch_size);
+
+        static constexpr int BATCH_FETCH_RETRIES = 3;
+        for (int attempt = 0; attempt < BATCH_FETCH_RETRIES && cachedIds.empty(); attempt++) {
+            RandomFetchFilter filter;
+            if (filterRelaxed) {
+                filter.albumIds = albumIds;
+            } else {
+                filter = buildTimerFilter(s, albumIds);
+            }
+
+            cachedIds = immichClient.fetchFilteredBatch(filter, s.timer_batch_size);
+
+            if (cachedIds.empty()) {
+                if (!filterRelaxed && (filter.favoriteOnly ||
+                    filter.takenAfter.length() > 0 || filter.takenBefore.length() > 0)) {
+                    Serial.println("[timer_wake] Filtered batch empty — relaxing filter");
+                    filterRelaxed = true;
+
+                    if (s.cycle_mode == CycleMode::Chronological ||
+                        s.cycle_mode == CycleMode::ReverseChronological) {
+                        settingsManager.saveField("timer_date", "");
+                        s.timer_last_date = "";
+                    }
+                    continue;
+                }
+                Serial.printf("[timer_wake] Batch fetch failed (attempt %d)\n", attempt + 1);
+            }
+        }
+
+        if (cachedIds.empty()) {
+            // All retries exhausted — log failure and sleep
+            Serial.println("[timer_wake] Batch fetch failed — no assets available");
+            wakeLogAppend(powerManager.getBatteryPercent(), WiFi.RSSI(), wifiMs,
+                          "", "", filterName(s.cycle_mode, filterRelaxed),
+                          WakeLogResult::FailFetch, true);
+            powerManager.enterDeepSleep(s.interval_min);
+            return;
+        }
+
+        Serial.printf("[timer_wake] Batch fetched %d IDs\n", (int)cachedIds.size());
+    } else {
+        Serial.printf("[timer_wake] Cache hit — %d IDs remaining\n", (int)cachedIds.size());
+    }
+
+    // Pop the first ID from cache
+    String assetId = cachedIds[0];
+    cachedIds.erase(cachedIds.begin());
+
+    // Save updated cache (remaining IDs) back to NVS
+    if (cachedIds.empty()) {
+        settingsManager.saveField("timer_ids", "");
+    } else {
+        settingsManager.saveField("timer_ids", buildCacheString(cacheHash, cachedIds).c_str());
+    }
+
+    // --- Download and display ---
+    static constexpr int DISPLAY_RETRIES = 3;
+    bool displayed = false;
+    String lastPhotoDate = "";
+    WakeLogResult lastResult = WakeLogResult::FailDownload;
+
+    for (int attempt = 0; attempt < DISPLAY_RETRIES && !displayed; attempt++) {
+        AssetInfo info = immichClient.fetchAssetInfo(assetId);
+        lastPhotoDate = info.dateTime;
+
+        uint8_t* jpegBuf = nullptr;
+        size_t jpegSize = 0;
+        if (!immichClient.downloadAsset(assetId, s.img_quality, &jpegBuf, &jpegSize)) {
+            Serial.printf("[timer_wake] Download failed (attempt %d)\n", attempt + 1);
+            lastResult = WakeLogResult::FailDownload;
+            continue;
+        }
+
+        ProcessedImage img = imagePipeline.process(jpegBuf, jpegSize);
+        free(jpegBuf);
+
+        if (img.valid) {
+            displayManager.showImage(img);
+            if (s.meta_flags != 0) {
+                displayManager.showMetadata(info, s.meta_flags, s.meta_pos,
+                                            s.date_fmt, s.time_fmt);
+            }
+            if (s.show_battery) {
+                uint8_t battPct = powerManager.getBatteryPercent();
+                displayManager.showBatteryIndicator(battPct, s.meta_pos);
+            }
+            displayManager.showSleepIndicator(s.meta_pos);
+            displayManager.refresh();
+            imagePipeline.freeImage(img);
+            displayed = true;
+            lastResult = WakeLogResult::Ok;
+
+            // Update chronological cursor with this photo's date
+            if (info.dateTime.length() > 0) {
+                settingsManager.saveField("timer_date", info.dateTime.c_str());
+            }
+        } else {
+            Serial.println("[timer_wake] Processing failed, retrying");
+            lastResult = WakeLogResult::FailProcess;
+        }
+    }
+
+    // Log this wake cycle
+    String logFilter = cacheWasEmpty
+        ? filterName(s.cycle_mode, filterRelaxed)
+        : String("cached");
+    wakeLogAppend(powerManager.getBatteryPercent(), WiFi.RSSI(), wifiMs,
+                  assetId, lastPhotoDate, logFilter, lastResult, true);
+
+    if (!displayed) {
+        Serial.println("[timer_wake] Failed to display photo");
+    }
+
+    Serial.printf("[timer_wake] Cycle complete — sleeping %u min\n", s.interval_min);
+    powerManager.enterDeepSleep(s.interval_min);
+}
 
 void setup() {
     auto cfg = M5.config();
+    cfg.clear_display = false;  // Don't clear/refresh e-ink on init
     M5.begin(cfg);
 
+    // Prevent any automatic e-ink refreshes until we explicitly call display()
+    M5.Display.setAutoDisplay(false);
+
     Serial.begin(115200);
-    Serial.println("[main] Immich Frame booting...");
+    Serial.println("[main] Immich Frame v1.0 booting...");
+    Serial.printf("[main] PSRAM: %u KB free / %u KB total\n",
+                  (unsigned)(heap_caps_get_free_size(MALLOC_CAP_SPIRAM) / 1024),
+                  (unsigned)(heap_caps_get_total_size(MALLOC_CAP_SPIRAM) / 1024));
+    Serial.printf("[main] Internal RAM: %u KB free\n",
+                  (unsigned)(heap_caps_get_free_size(MALLOC_CAP_INTERNAL) / 1024));
 
-    // Disable audio permanently
-    pinMode(PIN_AUDIO_PWR_EN, OUTPUT);
-    digitalWrite(PIN_AUDIO_PWR_EN, LOW);
-    pinMode(PIN_SPK_EN, OUTPUT);
-    digitalWrite(PIN_SPK_EN, LOW);
+    // Seed system clock from hardware RTC (RX8130CE) for immediate time availability
+    {
+        auto rtcDt = M5.Rtc.getDateTime();
+        struct tm t = {};
+        t.tm_year = rtcDt.date.year - 1900;
+        t.tm_mon  = rtcDt.date.month - 1;
+        t.tm_mday = rtcDt.date.date;
+        t.tm_hour = rtcDt.time.hours;
+        t.tm_min  = rtcDt.time.minutes;
+        t.tm_sec  = rtcDt.time.seconds;
+        time_t rtcTime = mktime(&t);
+        if (rtcTime > 1600000000) {  // Plausible (post-2020)
+            struct timeval tv = { .tv_sec = rtcTime, .tv_usec = 0 };
+            settimeofday(&tv, nullptr);
+            Serial.printf("[main] System clock seeded from RTC: %04d-%02d-%02d %02d:%02d:%02d\n",
+                          rtcDt.date.year, rtcDt.date.month, rtcDt.date.date,
+                          rtcDt.time.hours, rtcDt.time.minutes, rtcDt.time.seconds);
+        } else {
+            Serial.println("[main] RTC has no valid time — will sync from NTP after WiFi");
+        }
+    }
 
-    Serial.printf("[main] Free heap: %d, PSRAM: %d\n",
-                  ESP.getFreeHeap(), ESP.getFreePsram());
-    Serial.println("[main] Boot complete (skeleton)");
+    // Initialize core subsystems needed for both wake paths
+    powerManager.begin();
+    settingsManager.begin();
+    displayManager.begin(powerManager);
+
+    // Check if we woke from a timed deep sleep (persisted flag in NVS)
+    bool timerWoke = PowerManager::wasTimedSleepWake();
+
+    if (timerWoke) {
+        Serial.println("[main] Woke from timed deep sleep");
+
+        // Escape hatch: hold play/pause button during boot to stay awake
+        pinMode(PIN_BTN_DOWN, INPUT_PULLUP);
+        delay(50);
+        bool pauseHeld = (digitalRead(PIN_BTN_DOWN) == LOW);
+
+        if (!pauseHeld) {
+            // Minimal cycle: show photo and go back to sleep
+            timerWakeCycle();
+            // timerWakeCycle() calls enterDeepSleep — should not return
+            return;
+        }
+
+        // Escape hatch triggered — clear the flag and enter full interactive mode
+        PowerManager::clearTimedSleepFlag();
+        Serial.println("[main] Play/pause held — entering full interactive mode");
+    }
+
+    // Full interactive boot path
+    // Create state mutex
+    stateMutex = xSemaphoreCreateMutex();
+
+    // Initialize remaining subsystems
+    wifiManager.begin(settingsManager);
+    buttonHandler.begin(powerManager, settingsManager);
+
+    if (!wifiManager.isAPMode()) {
+        // Station mode — set up Immich and web server
+        Settings s = settingsManager.get();
+        immichClient.begin(s.immich_url, s.immich_key);
+        photoQueue.begin(immichClient, settingsManager);
+    }
+
+    // Start web server (works in both AP and station modes)
+    webServer.begin(settingsManager, immichClient, powerManager, wifiManager);
+    webServer.setActionCallback(webActionCallback);
+
+    // Initialize wake log (LittleFS already mounted by web server)
+    wakeLogBegin();
+
+    // Single display update after all init is complete
+    if (wifiManager.isAPMode()) {
+        displayManager.showSetupScreen();
+    } else {
+        // Skip "Loading photos" screen — the display task will show the first photo
+        // directly, avoiding a redundant 17s e-ink refresh cycle on boot.
+
+        // Create display task on Core 1
+        xTaskCreatePinnedToCore(displayTask, "display", 32768, nullptr, 1,
+                                &displayTaskHandle, 1);
+
+        // Enable light sleep only in station mode (not supported in AP mode)
+        powerManager.enableLightSleep();
+    }
+
+    Serial.println("[main] Boot complete");
 }
 
 void loop() {
     M5.update();
-    delay(1000);
+    powerManager.updateBatteryLED();
+
+    // Handle button events
+    ButtonEvent event = buttonHandler.poll();
+    switch (event) {
+        case ButtonEvent::NextPhoto:
+            if (xSemaphoreTake(stateMutex, pdMS_TO_TICKS(50)) == pdTRUE) {
+                refreshRequested = true;
+                xSemaphoreGive(stateMutex);
+            }
+            break;
+        case ButtonEvent::RandomPhoto:
+            if (xSemaphoreTake(stateMutex, pdMS_TO_TICKS(50)) == pdTRUE) {
+                randomRequested = true;
+                xSemaphoreGive(stateMutex);
+            }
+            break;
+        case ButtonEvent::PlayPause:
+            if (xSemaphoreTake(stateMutex, pdMS_TO_TICKS(50)) == pdTRUE) {
+                slideshowPlaying = !slideshowPlaying;
+                Serial.printf("[main] Slideshow: %s\n", slideshowPlaying ? "playing" : "paused");
+                xSemaphoreGive(stateMutex);
+            }
+            break;
+        case ButtonEvent::DeepSleep: {
+            Serial.println("[main] Entering timed deep sleep slideshow...");
+            Settings sleepS = settingsManager.get();
+            displayManager.showSleepIndicator(sleepS.meta_pos);
+            if (sleepS.show_battery) {
+                uint8_t battPct = powerManager.getBatteryPercent();
+                displayManager.showBatteryIndicator(battPct, sleepS.meta_pos);
+            }
+            displayManager.refresh();
+            powerManager.enterDeepSleep(sleepS.interval_min);
+            break;
+        }
+        case ButtonEvent::FactoryReset:
+            break;
+        case ButtonEvent::None:
+            break;
+        default: {
+            ButtonEvent unreachable = event;
+            (void)unreachable;
+            break;
+        }
+    }
+
+    delay(10);
 }

src/photo_queue.cpp

@@ -0,0 +1,388 @@
+#include "photo_queue.h"
+#include "immich_client.h"
+#include <ArduinoJson.h>
+#include <algorithm>
+#include "config.h"
+
+void PhotoQueue::begin(ImmichClient& client, SettingsManager& settings) {
+    _client = &client;
+    _settings = &settings;
+
+    Settings s = _settings->get();
+    _cursor = s.queue_cursor;
+}
+
+bool PhotoQueue::sync() {
+    if (_client == nullptr || _settings == nullptr) return false;
+
+    _lastSyncAttempt = millis();
+    _syncRequested = false;
+
+    Settings s = _settings->get();
+    auto albumIds = getSelectedAlbumIds();
+
+    bool success;
+    if (!albumIds.empty()) {
+        success = syncFromAlbums(albumIds, s);
+    } else {
+        success = syncFromAllPhotos(s);
+    }
+
+    if (!success) {
+        _syncRetryDelay = min(_syncRetryDelay * 2, SYNC_RETRY_MAX);
+        Serial.printf("[queue] Sync failed, retry in %lus\n", _syncRetryDelay / 1000);
+        return false;
+    }
+
+    _cursor = 0;
+    _lastSyncTime = millis();
+    _syncRetryDelay = SYNC_RETRY_MIN;
+    Serial.printf("[queue] Synced: %d assets, album_mode=%d, cursor at %d\n",
+                  _queue.size(), _albumMode, _cursor);
+    return true;
+}
+
+bool PhotoQueue::syncFromAlbums(const std::vector<String>& albumIds, const Settings& s) {
+    Serial.printf("[queue] Syncing from %d selected album(s)\n", albumIds.size());
+
+    // Get current album counts for 24h resync change detection
+    auto albums = _client->fetchAlbums();
+    std::map<String, int> albumCounts;
+    for (auto& selId : albumIds) {
+        for (auto& album : albums) {
+            if (album.id == selId) {
+                albumCounts[selId] = album.assetCount;
+                break;
+            }
+        }
+    }
+
+    // Use POST /api/search/random with albumIds filter (Immich v3 compatible).
+    // The server returns up to `size` random assets from the specified albums.
+    // For small albums (< TARGET_QUEUE_SIZE), all assets are returned.
+    auto batch = _client->fetchRandomAssets(
+        static_cast<int>(TARGET_QUEUE_SIZE), albumIds);
+
+    if (batch.empty()) {
+        Serial.println("[queue] No assets found in selected albums");
+        return false;
+    }
+
+    std::vector<String> newIds;
+    std::vector<String> newDates;
+    for (auto& asset : batch) {
+        if (std::find(newIds.begin(), newIds.end(), asset.id) != newIds.end()) continue;
+        newIds.push_back(asset.id);
+        newDates.push_back(asset.dateTime);
+    }
+
+    Serial.printf("[queue] Album sync: %d assets from server\n", newIds.size());
+
+    _queue = newIds;
+    _albumMode = true;
+    _lastAlbumCounts = albumCounts;
+
+    applyCycleMode(s, newDates);
+    return true;
+}
+
+bool PhotoQueue::syncFromAllPhotos(const Settings& s) {
+    Serial.printf("[queue] Syncing from all photos (global random)\n");
+
+    std::vector<String> newIds;
+    std::vector<String> newDates;
+    int rounds = 0;
+
+    Serial.printf("[queue] Fetching until %d usable assets (excluding %d shown)\n",
+                  TARGET_QUEUE_SIZE, _shown.size());
+
+    while (newIds.size() < TARGET_QUEUE_SIZE && rounds < MAX_FETCH_ROUNDS) {
+        auto batch = _client->fetchRandomAssets(50);
+        if (batch.empty()) {
+            Serial.printf("[queue] Fetch round %d returned empty\n", rounds + 1);
+            break;
+        }
+
+        for (auto& asset : batch) {
+            if (newIds.size() >= TARGET_QUEUE_SIZE) break;
+            if (std::find(newIds.begin(), newIds.end(), asset.id) != newIds.end()) continue;
+            if (std::find(_shown.begin(), _shown.end(), asset.id) != _shown.end()) continue;
+            newIds.push_back(asset.id);
+            newDates.push_back(asset.dateTime);
+        }
+
+        rounds++;
+        Serial.printf("[queue] Round %d: have %d/%d usable assets\n",
+                      rounds, newIds.size(), TARGET_QUEUE_SIZE);
+    }
+
+    if (newIds.empty()) return false;
+
+    _queue = newIds;
+    _albumMode = false;
+    _lastAlbumCounts.clear();
+
+    applyCycleMode(s, newDates);
+    Serial.printf("[queue] All-photos sync: %d assets in %d rounds\n",
+                  _queue.size(), rounds);
+    return true;
+}
+
+void PhotoQueue::applyCycleMode(const Settings& s, const std::vector<String>& dates) {
+    switch (s.cycle_mode) {
+        case CycleMode::Random:
+            applyFavoritesWeighting();
+            shuffle();
+            break;
+        case CycleMode::Chronological:
+            sortChronological(dates, false);
+            break;
+        case CycleMode::ReverseChronological:
+            sortChronological(dates, true);
+            break;
+        case CycleMode::FavoritesWeighted:
+            applyFavoritesWeighting();
+            shuffle();
+            break;
+        case CycleMode::WeightedChronological:
+            applyRecencyWeighting(dates, true);
+            shuffle();
+            break;
+        case CycleMode::WeightedReverseChronological:
+            applyRecencyWeighting(dates, false);
+            shuffle();
+            break;
+        // No default — compiler warns on unhandled CycleMode via -Wswitch
+    }
+}
+
+void PhotoQueue::requestSync() {
+    _syncRequested = true;
+}
+
+String PhotoQueue::next() {
+    // Auto-refill when queue is exhausted
+    if (_queue.empty() || _cursor >= _queue.size()) {
+        if (_albumMode && !_queue.empty()) {
+            // Album mode: reshuffle existing queue instead of re-fetching
+            Serial.println("[queue] Album queue exhausted, reshuffling in place");
+            Settings s = _settings->get();
+            // Clear shown history since we're replaying the same set
+            _shown.clear();
+            applyCycleMode(s, {});
+            _cursor = 0;
+        } else {
+            // All-photos mode: fetch a new batch
+            Serial.println("[queue] Queue exhausted, fetching new batch");
+            sync();
+            _cursor = 0;
+        }
+    }
+
+    if (_queue.empty()) return "";
+
+    String id = _queue[_cursor++];
+
+    // Track shown IDs for dedup on next refill
+    _shown.push_back(id);
+    if (_shown.size() > MAX_SHOWN_HISTORY) {
+        _shown.erase(_shown.begin());
+    }
+
+    // Persist cursor
+    _settings->saveField("queue_cursor", static_cast<uint32_t>(_cursor));
+
+    return id;
+}
+
+String PhotoQueue::random() {
+    if (_queue.empty()) return "";
+    size_t idx = ::random(0, _queue.size());
+    return _queue[idx];
+}
+
+String PhotoQueue::current() {
+    if (_queue.empty()) return "";
+    size_t idx = (_cursor > 0) ? _cursor - 1 : 0;
+    return _queue[idx];
+}
+
+size_t PhotoQueue::size() {
+    return _queue.size();
+}
+
+bool PhotoQueue::needsResync() {
+    if (_syncRequested) return true;
+
+    unsigned long now = millis();
+
+    // If never synced successfully, use retry backoff
+    if (_lastSyncTime == 0) {
+        if (_lastSyncAttempt == 0) return true;
+        return (now - _lastSyncAttempt) >= _syncRetryDelay;
+    }
+
+    // Normal resync interval
+    unsigned long elapsed = now - _lastSyncTime;
+    if (elapsed < (QUEUE_RESYNC_HOURS * 3600000UL)) return false;
+
+    // In album mode, check if album sizes actually changed before re-fetching
+    if (_albumMode && !_lastAlbumCounts.empty()) {
+        auto albums = _client->fetchAlbums();
+        auto selectedIds = getSelectedAlbumIds();
+        bool changed = false;
+
+        for (auto& selId : selectedIds) {
+            int currentCount = 0;
+            for (auto& album : albums) {
+                if (album.id == selId) {
+                    currentCount = album.assetCount;
+                    break;
+                }
+            }
+            auto it = _lastAlbumCounts.find(selId);
+            int lastCount = (it != _lastAlbumCounts.end()) ? it->second : -1;
+            if (currentCount != lastCount) {
+                Serial.printf("[queue] Album %s count changed: %d -> %d\n",
+                              selId.c_str(), lastCount, currentCount);
+                changed = true;
+                break;
+            }
+        }
+
+        if (!changed) {
+            Serial.println("[queue] Album counts unchanged, reshuffling instead of re-fetching");
+            Settings s = _settings->get();
+            _shown.clear();
+            applyCycleMode(s, {});
+            _cursor = 0;
+            _lastSyncTime = millis();
+            return false;
+        }
+    }
+
+    return true;
+}
+
+String PhotoQueue::findNextPortrait() {
+    if (_client == nullptr) return "";
+
+    size_t scanEnd = min(_cursor + PORTRAIT_LOOKAHEAD, _queue.size());
+    for (size_t i = _cursor; i < scanEnd; i++) {
+        AssetInfo info = _client->fetchAssetInfo(_queue[i]);
+        if (info.isPortrait) {
+            String id = _queue[i];
+            _queue.erase(_queue.begin() + i);
+            Serial.printf("[queue] Found portrait pair: %s (scanned %d ahead)\n",
+                          id.c_str(), (int)(i - _cursor + 1));
+            return id;
+        }
+    }
+    Serial.println("[queue] No portrait pair found in lookahead");
+    return "";
+}
+
+void PhotoQueue::shuffle() {
+    for (size_t i = _queue.size() - 1; i > 0; i--) {
+        size_t j = ::random(0, i + 1);
+        std::swap(_queue[i], _queue[j]);
+    }
+}
+
+void PhotoQueue::sortChronological(const std::vector<String>& dates, bool reverse) {
+    if (dates.size() != _queue.size()) {
+        // Dates unavailable (e.g. reshuffle after exhaustion) — fall back to shuffle
+        if (dates.empty()) {
+            shuffle();
+            return;
+        }
+        Serial.println("[queue] sortChronological: date/queue size mismatch, skipping");
+        return;
+    }
+
+    // Build index array sorted by date (ISO 8601 strings compare correctly)
+    std::vector<size_t> indices(dates.size());
+    for (size_t i = 0; i < indices.size(); i++) indices[i] = i;
+
+    std::sort(indices.begin(), indices.end(), [&](size_t a, size_t b) {
+        return dates[a] < dates[b];
+    });
+
+    if (reverse) std::reverse(indices.begin(), indices.end());
+
+    std::vector<String> sorted;
+    sorted.reserve(_queue.size());
+    for (size_t idx : indices) {
+        sorted.push_back(_queue[idx]);
+    }
+    _queue = sorted;
+}
+
+void PhotoQueue::applyRecencyWeighting(const std::vector<String>& dates, bool favorRecent) {
+    if (dates.size() != _queue.size() || _queue.size() < 3) {
+        // Dates unavailable — fall back to shuffle
+        if (dates.empty()) return;
+        return;
+    }
+
+    // Sort queue by date (oldest first)
+    std::vector<size_t> indices(dates.size());
+    for (size_t i = 0; i < indices.size(); i++) indices[i] = i;
+    std::sort(indices.begin(), indices.end(), [&](size_t a, size_t b) {
+        return dates[a] < dates[b];
+    });
+
+    std::vector<String> sorted;
+    sorted.reserve(_queue.size());
+    for (size_t idx : indices) {
+        sorted.push_back(_queue[idx]);
+    }
+    _queue = sorted;
+
+    // Duplicate the preferred third (3x copies total)
+    size_t third = _queue.size() / 3;
+    size_t start = favorRecent ? _queue.size() - third : 0;
+    size_t end = favorRecent ? _queue.size() : third;
+
+    for (size_t i = start; i < end; i++) {
+        _queue.push_back(_queue[i]);
+        _queue.push_back(_queue[i]);
+    }
+
+    Serial.printf("[queue] Recency weighting: %s third duplicated (%d -> %d entries)\n",
+                  favorRecent ? "recent" : "oldest", (int)sorted.size(), (int)_queue.size());
+}
+
+void PhotoQueue::applyFavoritesWeighting() {
+    if (_client == nullptr) return;
+
+    Settings s = _settings->get();
+    if (s.cycle_mode != CycleMode::FavoritesWeighted) return;
+
+    auto favorites = _client->fetchFavoriteAssetIds();
+    for (auto& fav : favorites) {
+        bool inQueue = false;
+        for (auto& id : _queue) {
+            if (id == fav) { inQueue = true; break; }
+        }
+        if (inQueue) {
+            _queue.push_back(fav);
+            _queue.push_back(fav);
+        }
+    }
+}
+
+std::vector<String> PhotoQueue::getSelectedAlbumIds() {
+    std::vector<String> ids;
+    Settings s = _settings->get();
+
+    JsonDocument doc;
+    DeserializationError err = deserializeJson(doc, s.albums_json);
+    if (err) return ids;
+
+    JsonArray arr = doc.as<JsonArray>();
+    for (JsonVariant v : arr) {
+        ids.push_back(v.as<String>());
+    }
+    return ids;
+}

src/photo_queue.h

@@ -0,0 +1,50 @@
+#pragma once
+
+#include <Arduino.h>
+#include <map>
+#include <vector>
+#include "settings.h"
+
+class ImmichClient;
+
+class PhotoQueue {
+public:
+    void begin(ImmichClient& client, SettingsManager& settings);
+    bool sync();
+    void requestSync();
+    String next();
+    String random();
+    String current();
+    size_t size();
+    bool needsResync();
+    String findNextPortrait();
+
+private:
+    ImmichClient* _client = nullptr;
+    SettingsManager* _settings = nullptr;
+
+    std::vector<String> _queue;
+    std::vector<String> _shown;  // Recently shown IDs for dedup on refill
+    size_t _cursor = 0;
+    unsigned long _lastSyncTime = 0;
+    unsigned long _lastSyncAttempt = 0;
+    unsigned long _syncRetryDelay = 10000;
+    volatile bool _syncRequested = false;
+    bool _albumMode = false;
+    std::map<String, int> _lastAlbumCounts;
+
+    static constexpr unsigned long SYNC_RETRY_MIN = 10000;     // 10 seconds
+    static constexpr unsigned long SYNC_RETRY_MAX = 300000;    // 5 minutes
+    static constexpr size_t TARGET_QUEUE_SIZE = 50;
+    static constexpr int MAX_FETCH_ROUNDS = 5;
+    static constexpr size_t MAX_SHOWN_HISTORY = 200;
+
+    bool syncFromAlbums(const std::vector<String>& albumIds, const Settings& s);
+    bool syncFromAllPhotos(const Settings& s);
+    void applyCycleMode(const Settings& s, const std::vector<String>& dates);
+    void shuffle();
+    void sortChronological(const std::vector<String>& dates, bool reverse);
+    void applyRecencyWeighting(const std::vector<String>& dates, bool favorRecent);
+    void applyFavoritesWeighting();
+    std::vector<String> getSelectedAlbumIds();
+};

src/power_manager.cpp

@@ -0,0 +1,169 @@
+#include "power_manager.h"
+#include <M5Unified.h>
+#include <Preferences.h>
+#include <esp_pm.h>
+
+static const char* NVS_PM_NAMESPACE = "pm_state";
+
+void PowerManager::begin() {
+    Serial.println("[power] Initializing power manager");
+
+    // Disable audio power rails permanently
+    pinMode(PIN_AUDIO_PWR_EN, OUTPUT);
+    digitalWrite(PIN_AUDIO_PWR_EN, LOW);
+    pinMode(PIN_SPK_EN, OUTPUT);
+    digitalWrite(PIN_SPK_EN, LOW);
+
+    // Initialize RGB LEDs via M5Unified (handles NeoPixel on G21)
+    // M5Unified manages the LED strip internally
+
+    clearLEDs();
+
+    Serial.printf("[power] Battery: %d%%, Charging: %s\n",
+                  getBatteryPercent(), isCharging() ? "yes" : "no");
+}
+
+uint8_t PowerManager::getBatteryPercent() {
+    int32_t level = M5.Power.getBatteryLevel();
+    if (level < 0) level = 0;
+    if (level > 100) level = 100;
+    _lastBatteryPct = static_cast<uint8_t>(level);
+    return _lastBatteryPct;
+}
+
+bool PowerManager::isCharging() {
+    return M5.Power.isCharging();
+}
+
+void PowerManager::updateBatteryLED() {
+    unsigned long now = millis();
+    uint8_t pct = getBatteryPercent();
+
+    // Auto deep sleep at critical level
+    if (pct <= BATTERY_SHUTDOWN_PCT && !isCharging()) {
+        Serial.println("[power] Battery critical — entering deep sleep");
+        enterDeepSleep();
+        return;
+    }
+
+    // Determine pulse interval based on battery level
+    unsigned long interval = 0;
+    uint8_t r = 0, g = 0, b = 0;
+
+    if (isCharging()) {
+        interval = BATTERY_WARN_INTERVAL_MS;
+        g = 255;  // Green pulse
+    } else if (pct <= BATTERY_CRITICAL_PCT) {
+        interval = BATTERY_CRIT_INTERVAL_MS;
+        r = 255;  // Red pulse
+    } else if (pct <= BATTERY_LOW_PCT) {
+        interval = BATTERY_WARN_INTERVAL_MS;
+        r = 255; g = 165;  // Orange pulse
+    } else {
+        // Battery fine — no LED
+        return;
+    }
+
+    if (now - _lastLEDPulse >= interval) {
+        _lastLEDPulse = now;
+        flashLED(r, g, b);
+    }
+}
+
+void PowerManager::flashLED(uint8_t r, uint8_t g, uint8_t b, uint16_t duration_ms) {
+    // Scale by brightness
+    float scale = _ledBrightness / 255.0f;
+    uint8_t sr = static_cast<uint8_t>(r * scale);
+    uint8_t sg = static_cast<uint8_t>(g * scale);
+    uint8_t sb = static_cast<uint8_t>(b * scale);
+
+    setLED(0, sr, sg, sb);
+    setLED(1, sr, sg, sb);
+
+    // Non-blocking: we'll clear on next update cycle
+    // For simplicity, use a short blocking delay for LED flash feedback
+    delay(duration_ms);
+    clearLEDs();
+}
+
+void PowerManager::enterDeepSleep(uint32_t sleepMinutes) {
+    if (sleepMinutes > 0) {
+        Serial.printf("[power] Entering timed deep sleep — wake in %u min\n", sleepMinutes);
+    } else {
+        Serial.println("[power] Entering indefinite deep sleep");
+    }
+    Serial.flush();
+    delay(100);
+
+    clearLEDs();
+
+    // Persist flag in NVS so we know on next boot this was a timed sleep
+    if (sleepMinutes > 0) {
+        Preferences prefs;
+        prefs.begin(NVS_PM_NAMESPACE, false);
+        prefs.putUChar("timed_sleep", 1);
+        prefs.end();
+    }
+
+    uint64_t sleepUs = (sleepMinutes > 0)
+        ? static_cast<uint64_t>(sleepMinutes) * 60ULL * 1000000ULL
+        : 0;
+
+    // M5.Power.deepSleep handles M5PM1 hardware properly
+    M5.Power.deepSleep(sleepUs);
+}
+
+bool PowerManager::wasTimedSleepWake() {
+    Preferences prefs;
+    prefs.begin(NVS_PM_NAMESPACE, true);
+    uint8_t flag = prefs.getUChar("timed_sleep", 0);
+    prefs.end();
+    return flag == 1;
+}
+
+void PowerManager::clearTimedSleepFlag() {
+    Preferences prefs;
+    prefs.begin(NVS_PM_NAMESPACE, false);
+    prefs.putUChar("timed_sleep", 0);
+    prefs.end();
+    Serial.println("[power] Timed sleep flag cleared");
+}
+
+void PowerManager::enableLightSleep() {
+    esp_pm_config_esp32s3_t pm_config;
+    pm_config.max_freq_mhz = 240;
+    pm_config.min_freq_mhz = 80;
+    pm_config.light_sleep_enable = true;
+    esp_err_t err = esp_pm_configure(&pm_config);
+    if (err == ESP_OK) {
+        Serial.println("[power] Light sleep enabled (80-240MHz)");
+    } else {
+        Serial.printf("[power] Light sleep config failed: %d\n", err);
+    }
+}
+
+void PowerManager::disableEPDPower() {
+    // M5PM1 PYG0 controls e-paper power — managed via M5Unified Power API
+    // M5.Power controls the PM1 rails
+    Serial.println("[power] EPD power disabled");
+}
+
+void PowerManager::enableEPDPower() {
+    Serial.println("[power] EPD power enabled");
+}
+
+void PowerManager::setLED(uint8_t index, uint8_t r, uint8_t g, uint8_t b) {
+    // M5Unified provides LED control — exact API depends on board support
+    // Fallback: direct NeoPixel control if M5Unified doesn't cover it
+    (void)index;
+    (void)r;
+    (void)g;
+    (void)b;
+    // TODO: Implement via M5Unified LED API or direct NeoPixel library
+    // This will be filled in during hardware bring-up when we can test on device
+}
+
+void PowerManager::clearLEDs() {
+    setLED(0, 0, 0, 0);
+    setLED(1, 0, 0, 0);
+}

src/power_manager.h

@@ -0,0 +1,29 @@
+#pragma once
+
+#include <Arduino.h>
+#include <esp_sleep.h>
+#include "config.h"
+
+class PowerManager {
+public:
+    void begin();
+    uint8_t getBatteryPercent();
+    bool isCharging();
+    void updateBatteryLED();
+    void flashLED(uint8_t r, uint8_t g, uint8_t b, uint16_t duration_ms = LED_PULSE_DURATION_MS);
+    void enterDeepSleep(uint32_t sleepMinutes = 0);
+    void enableLightSleep();
+    void disableEPDPower();
+    void enableEPDPower();
+
+    static bool wasTimedSleepWake();
+    static void clearTimedSleepFlag();
+
+private:
+    uint8_t _lastBatteryPct = 100;
+    unsigned long _lastLEDPulse = 0;
+    uint8_t _ledBrightness = DEFAULT_LED_BRIGHTNESS;
+
+    void setLED(uint8_t index, uint8_t r, uint8_t g, uint8_t b);
+    void clearLEDs();
+};

src/settings.cpp

@@ -0,0 +1,111 @@
+#include "settings.h"
+#include <Preferences.h>
+
+static const char* NVS_NAMESPACE = "immich_frame";
+static Preferences prefs;
+
+void SettingsManager::begin() {
+    prefs.begin(NVS_NAMESPACE, false);
+    Serial.println("[settings] NVS initialized");
+}
+
+Settings SettingsManager::get() {
+    Settings s;
+    s.wifi_ssid     = readString("wifi_ssid");
+    s.wifi_pass     = readString("wifi_pass");
+    s.immich_url    = readString("immich_url", DEFAULT_IMMICH_URL);
+    s.immich_key    = readString("immich_key");
+    s.interval_min  = readU8("interval_m", DEFAULT_INTERVAL_MIN);
+    s.cycle_mode    = static_cast<CycleMode>(readU8("cycle_mode", DEFAULT_CYCLE_MODE));
+    s.img_quality   = static_cast<ImageQuality>(readU8("img_quality", DEFAULT_IMG_QUALITY));
+    s.meta_flags    = readU8("meta_flags", DEFAULT_META_FLAGS);
+    s.meta_pos      = static_cast<MetaPosition>(readU8("meta_pos", DEFAULT_META_POS));
+    s.date_fmt      = readString("date_fmt", "%Y-%m-%d");
+    s.time_fmt      = readString("time_fmt", "%H:%M:%S");
+    s.pipeline_mode  = readU8("pipe_mode", DEFAULT_PIPELINE_MODE);
+    s.dither_noise   = readU8("dith_noise", DEFAULT_DITHER_NOISE);
+    s.meta_translucent = readU8("meta_trans", 0);
+    s.led_brightness = readU8("led_bright", DEFAULT_LED_BRIGHTNESS);
+    s.show_battery  = readU8("show_batt", 1);
+    s.queue_cursor  = readU32("queue_cursor", 0);
+    s.albums_json   = readString("albums_json", "[]");
+    s.timer_last_date = readString("timer_date", "");
+    s.timer_batch_size = readU8("timer_batch", DEFAULT_TIMER_BATCH);
+    return s;
+}
+
+void SettingsManager::save(const Settings& s) {
+    writeString("wifi_ssid", s.wifi_ssid);
+    writeString("wifi_pass", s.wifi_pass);
+    writeString("immich_url", s.immich_url);
+    writeString("immich_key", s.immich_key);
+    writeU8("interval_m", s.interval_min);
+    writeU8("cycle_mode", static_cast<uint8_t>(s.cycle_mode));
+    writeU8("img_quality", static_cast<uint8_t>(s.img_quality));
+    writeU8("meta_flags", s.meta_flags);
+    writeU8("meta_pos", static_cast<uint8_t>(s.meta_pos));
+    writeString("date_fmt", s.date_fmt);
+    writeString("time_fmt", s.time_fmt);
+    writeU8("pipe_mode", s.pipeline_mode);
+    writeU8("dith_noise", s.dither_noise);
+    writeU8("meta_trans", s.meta_translucent);
+    writeU8("led_bright", s.led_brightness);
+    writeU8("show_batt", s.show_battery);
+    writeU32("queue_cursor", s.queue_cursor);
+    writeString("albums_json", s.albums_json);
+    writeString("timer_date", s.timer_last_date);
+    writeU8("timer_batch", s.timer_batch_size);
+    Serial.println("[settings] All settings saved");
+}
+
+void SettingsManager::saveField(const char* key, uint8_t value) {
+    writeU8(key, value);
+}
+
+void SettingsManager::saveField(const char* key, uint32_t value) {
+    writeU32(key, value);
+}
+
+void SettingsManager::saveField(const char* key, const char* value) {
+    writeString(key, String(value));
+}
+
+String SettingsManager::readField(const char* key, const char* defaultValue) {
+    return readString(key, defaultValue);
+}
+
+void SettingsManager::factoryReset() {
+    prefs.clear();
+    Serial.println("[settings] Factory reset — rebooting");
+    delay(500);
+    ESP.restart();
+}
+
+bool SettingsManager::isProvisioned() {
+    String ssid = readString("wifi_ssid");
+    return ssid.length() > 0;
+}
+
+String SettingsManager::readString(const char* key, const char* defaultValue) {
+    return prefs.getString(key, defaultValue);
+}
+
+uint8_t SettingsManager::readU8(const char* key, uint8_t defaultValue) {
+    return prefs.getUChar(key, defaultValue);
+}
+
+uint32_t SettingsManager::readU32(const char* key, uint32_t defaultValue) {
+    return prefs.getUInt(key, defaultValue);
+}
+
+void SettingsManager::writeString(const char* key, const String& value) {
+    prefs.putString(key, value);
+}
+
+void SettingsManager::writeU8(const char* key, uint8_t value) {
+    prefs.putUChar(key, value);
+}
+
+void SettingsManager::writeU32(const char* key, uint32_t value) {
+    prefs.putUInt(key, value);
+}

src/settings.h

@@ -0,0 +1,96 @@
+#pragma once
+
+#include <Arduino.h>
+#include "config.h"
+
+enum class CycleMode : uint8_t {
+    Random = 0,
+    Chronological = 1,
+    ReverseChronological = 2,
+    FavoritesWeighted = 3,
+    WeightedChronological = 4,
+    WeightedReverseChronological = 5
+};
+
+enum class ImageQuality : uint8_t {
+    Preview = 0,
+    Original = 1
+};
+
+enum class MetaPosition : uint8_t {
+    // Captioned mode (full-width bar)
+    CaptionBottom = 0,
+    CaptionTop = 1,
+    // Overlay mode (corner badge)
+    OverlayTopLeft = 2,
+    OverlayTopRight = 3,
+    OverlayBottomLeft = 4,
+    OverlayBottomRight = 5
+};
+
+// Metadata flags bitmask
+constexpr uint8_t META_DATE     = 0x01;
+constexpr uint8_t META_TIME     = 0x20;
+constexpr uint8_t META_LOCATION = 0x02;
+constexpr uint8_t META_PEOPLE   = 0x04;
+constexpr uint8_t META_ALBUM    = 0x08;
+constexpr uint8_t META_CAMERA   = 0x10;
+
+struct Settings {
+    // WiFi
+    String wifi_ssid;
+    String wifi_pass;
+
+    // Immich
+    String immich_url;
+    String immich_key;
+
+    // Slideshow
+    uint8_t interval_min;
+    CycleMode cycle_mode;
+    ImageQuality img_quality;
+
+    // Display
+    uint8_t meta_flags;
+    MetaPosition meta_pos;
+    String date_fmt;  // strftime-style, default "%Y-%m-%d"
+    String time_fmt;  // strftime-style, default "%H:%M:%S"
+
+    // Image pipeline
+    uint8_t pipeline_mode;  // 0=dynamic, 1=balanced, 2=none
+    uint8_t dither_noise;   // 1=blue noise dither smoothing ON, 0=OFF
+    uint8_t meta_translucent; // 1=checkerboard 50% opacity badge bg, 0=solid black
+
+    // Device
+    uint8_t led_brightness;
+    uint8_t show_battery;   // 1 = show battery indicator on display
+    uint32_t queue_cursor;
+    String albums_json;
+
+    // Deep sleep chronological cursor (ISO datetime of last shown photo)
+    String timer_last_date;
+
+    // Deep sleep batch cache size
+    uint8_t timer_batch_size;
+};
+
+class SettingsManager {
+public:
+    void begin();
+    Settings get();
+    void save(const Settings& s);
+    void saveField(const char* key, uint8_t value);
+    void saveField(const char* key, uint32_t value);
+    void saveField(const char* key, const char* value);
+    String readField(const char* key, const char* defaultValue = "");
+    void factoryReset();
+    bool isProvisioned();
+
+private:
+    String readString(const char* key, const char* defaultValue = "");
+    uint8_t readU8(const char* key, uint8_t defaultValue = 0);
+    uint32_t readU32(const char* key, uint32_t defaultValue = 0);
+    void writeString(const char* key, const String& value);
+    void writeU8(const char* key, uint8_t value);
+    void writeU32(const char* key, uint32_t value);
+};

src/stb_image_impl.cpp

@@ -0,0 +1,15 @@
+#include <esp_heap_caps.h>
+
+#define STB_IMAGE_IMPLEMENTATION
+#define STBI_ONLY_JPEG
+#define STBI_NO_STDIO
+#define STBI_NO_HDR
+#define STBI_NO_LINEAR
+#define STBI_MALLOC(sz)        heap_caps_malloc(sz, MALLOC_CAP_SPIRAM)
+#define STBI_REALLOC(p,newsz)  heap_caps_realloc(p, newsz, MALLOC_CAP_SPIRAM)
+#define STBI_FREE(p)           free(p)
+
+#pragma GCC diagnostic push
+#pragma GCC diagnostic ignored "-Wunused-function"
+#include "stb_image.h"
+#pragma GCC diagnostic pop

src/time_utils.h

@@ -0,0 +1,33 @@
+#pragma once
+
+#include <Arduino.h>
+#include <time.h>
+
+// Returns true if the system clock has been set to a plausible time (year >= 2020).
+inline bool hasValidTime() {
+    time_t now = time(nullptr);
+    struct tm t;
+    gmtime_r(&now, &t);
+    return (t.tm_year + 1900) >= 2020;
+}
+
+// Returns the current UTC time as an ISO 8601 string (e.g., "2026-08-04T17:30:00.000Z").
+inline String isoNow() {
+    time_t now = time(nullptr);
+    struct tm t;
+    gmtime_r(&now, &t);
+    char buf[32];
+    strftime(buf, sizeof(buf), "%Y-%m-%dT%H:%M:%S.000Z", &t);
+    return String(buf);
+}
+
+// Returns (now - 30 days) as an ISO 8601 UTC string.
+inline String isoNowMinus30d() {
+    time_t now = time(nullptr);
+    now -= 30 * 24 * 3600;  // Subtract 30 days in seconds
+    struct tm t;
+    gmtime_r(&now, &t);
+    char buf[32];
+    strftime(buf, sizeof(buf), "%Y-%m-%dT%H:%M:%S.000Z", &t);
+    return String(buf);
+}

src/wake_log.cpp

@@ -0,0 +1,183 @@
+#include "wake_log.h"
+#include <LittleFS.h>
+#include <Preferences.h>
+#include <esp_heap_caps.h>
+#include "time_utils.h"
+
+static const char* LOG_PATH = "/wake_log.csv";
+static const char* NVS_LOG_NS = "wake_log";
+static constexpr size_t MAX_LOG_SIZE = 200 * 1024;  // 200KB cap
+static constexpr size_t KEEP_SIZE = 100 * 1024;     // Keep last 100KB on truncation
+
+static bool _logReady = false;
+static uint32_t _bootCount = 0;
+static bool _rtcValidAtBoot = false;
+
+static const char* resultStr(WakeLogResult r) {
+    switch (r) {
+        case WakeLogResult::Ok:           return "ok";
+        case WakeLogResult::FailFetch:    return "fail_fetch";
+        case WakeLogResult::FailDownload: return "fail_download";
+        case WakeLogResult::FailProcess:  return "fail_process";
+        default: {
+            WakeLogResult unreachable = r;
+            (void)unreachable;
+            return "unknown";
+        }
+    }
+}
+
+void wakeLogBegin() {
+    // Record RTC validity before anything else might change the clock
+    _rtcValidAtBoot = hasValidTime();
+
+    // Mount LittleFS (idempotent — safe to call if already mounted by web server)
+    if (!LittleFS.begin(true)) {
+        Serial.println("[wake_log] LittleFS mount failed — logging disabled");
+        _logReady = false;
+        return;
+    }
+
+    // Increment boot counter in NVS (fire-and-forget)
+    Preferences prefs;
+    if (prefs.begin(NVS_LOG_NS, false)) {
+        _bootCount = prefs.getUInt("boot_cnt", 0) + 1;
+        prefs.putUInt("boot_cnt", _bootCount);
+        prefs.end();
+    } else {
+        Serial.println("[wake_log] NVS open failed — using boot_count=0");
+        _bootCount = 0;
+    }
+
+    _logReady = true;
+    Serial.printf("[wake_log] Ready (boot #%u, rtc_valid=%d)\n",
+                  _bootCount, _rtcValidAtBoot ? 1 : 0);
+}
+
+// Truncate log file to keep only the last KEEP_SIZE bytes.
+// Uses PSRAM buffer. Skips silently on failure.
+static void truncateIfNeeded() {
+    File f = LittleFS.open(LOG_PATH, "r");
+    if (!f) return;
+
+    size_t fileSize = f.size();
+    if (fileSize <= MAX_LOG_SIZE) {
+        f.close();
+        return;
+    }
+
+    Serial.printf("[wake_log] Log at %uKB — truncating to last %uKB\n",
+                  (unsigned)(fileSize / 1024), (unsigned)(KEEP_SIZE / 1024));
+
+    // Allocate buffer in PSRAM
+    uint8_t* buf = (uint8_t*)ps_malloc(KEEP_SIZE);
+    if (!buf) {
+        Serial.println("[wake_log] PSRAM alloc failed — skipping truncation");
+        f.close();
+        return;
+    }
+
+    // Seek to (fileSize - KEEP_SIZE) and read the tail
+    f.seek(fileSize - KEEP_SIZE);
+    size_t bytesRead = f.read(buf, KEEP_SIZE);
+    f.close();
+
+    if (bytesRead == 0) {
+        free(buf);
+        return;
+    }
+
+    // Find first newline to avoid a partial line at the start
+    size_t start = 0;
+    for (size_t i = 0; i < bytesRead; i++) {
+        if (buf[i] == '\n') {
+            start = i + 1;
+            break;
+        }
+    }
+
+    // Rewrite the file with just the tail
+    File out = LittleFS.open(LOG_PATH, "w");
+    if (!out) {
+        Serial.println("[wake_log] File rewrite failed — skipping truncation");
+        free(buf);
+        return;
+    }
+
+    out.write(buf + start, bytesRead - start);
+    out.close();
+    free(buf);
+
+    Serial.printf("[wake_log] Truncated to %uKB\n",
+                  (unsigned)((bytesRead - start) / 1024));
+}
+
+void wakeLogAppend(uint8_t battPct, int wifiRssi, uint32_t wifiMs,
+                   const String& assetId, const String& photoDate,
+                   const String& filter, WakeLogResult result, bool isDeepSleep) {
+    if (!_logReady) return;
+
+    // Read error tracking from NVS (defaults on failure)
+    uint32_t errorsTotal = 0;
+    String lastErrorTs = "";
+
+    Preferences prefs;
+    if (prefs.begin(NVS_LOG_NS, false)) {
+        errorsTotal = prefs.getUInt("err_total", 0);
+        lastErrorTs = prefs.getString("err_last_ts", "");
+
+        // Update error counters if this is a failure
+        if (result != WakeLogResult::Ok) {
+            errorsTotal++;
+            lastErrorTs = hasValidTime() ? isoNow() : "unknown";
+            prefs.putUInt("err_total", errorsTotal);
+            prefs.putString("err_last_ts", lastErrorTs);
+        }
+        prefs.end();
+    } else {
+        Serial.println("[wake_log] NVS read failed — using defaults");
+    }
+
+    // Build CSV line
+    uint32_t cycleMs = millis();
+    uint32_t freePsramKb = (uint32_t)(heap_caps_get_free_size(MALLOC_CAP_SPIRAM) / 1024);
+    uint32_t freeHeapKb = (uint32_t)(heap_caps_get_free_size(MALLOC_CAP_INTERNAL) / 1024);
+    String timestamp = hasValidTime() ? isoNow() : "no_clock";
+
+    char line[512];
+    snprintf(line, sizeof(line),
+             "%s,%u,%u,%u,%d,%u,%u,%d,%u,%s,%s,%s,%s,%s,%s,%u\n",
+             timestamp.c_str(),
+             (unsigned)battPct,
+             (unsigned)freePsramKb,
+             (unsigned)freeHeapKb,
+             wifiRssi,
+             (unsigned)wifiMs,
+             (unsigned)cycleMs,
+             _rtcValidAtBoot ? 1 : 0,
+             (unsigned)_bootCount,
+             filter.c_str(),
+             assetId.c_str(),
+             photoDate.c_str(),
+             resultStr(result),
+             isDeepSleep ? "sleep" : "normal",
+             lastErrorTs.c_str(),
+             (unsigned)errorsTotal);
+
+    // Append to log file
+    File f = LittleFS.open(LOG_PATH, "a");
+    if (!f) {
+        Serial.println("[wake_log] File open failed — skipping log entry");
+        return;
+    }
+
+    f.print(line);
+    f.close();
+
+    Serial.printf("[wake_log] Logged: %s %s (%s)\n",
+                  resultStr(result), assetId.c_str(),
+                  isDeepSleep ? "sleep" : "normal");
+
+    // Check if truncation is needed
+    truncateIfNeeded();
+}

src/wake_log.h

@@ -0,0 +1,21 @@
+#pragma once
+
+#include <Arduino.h>
+
+enum class WakeLogResult : uint8_t {
+    Ok,
+    FailFetch,
+    FailDownload,
+    FailProcess
+};
+
+// Initialize the wake log subsystem. Call once early in boot.
+// Mounts LittleFS, increments boot counter, records RTC validity.
+// Fail-safe: if anything fails, logging becomes a no-op.
+void wakeLogBegin();
+
+// Append one CSV line to the persistent log.
+// Fail-safe: if filesystem or NVS is unavailable, silently returns.
+void wakeLogAppend(uint8_t battPct, int wifiRssi, uint32_t wifiMs,
+                   const String& assetId, const String& photoDate,
+                   const String& filter, WakeLogResult result, bool isDeepSleep);

src/web_server.cpp

@@ -0,0 +1,382 @@
+#include "web_server.h"
+#include <ArduinoJson.h>
+#include <LittleFS.h>
+#include <Update.h>
+#include <WiFi.h>
+#include "immich_client.h"
+#include "power_manager.h"
+#include "wifi_manager.h"
+#include "config.h"
+
+void AppWebServer::begin(SettingsManager& settings, ImmichClient& immich,
+                          PowerManager& power, WiFiManager& wifi) {
+    _settings = &settings;
+    _immich = &immich;
+    _power = &power;
+    _wifi = &wifi;
+
+    if (!LittleFS.begin(true)) {
+        Serial.println("[web] LittleFS mount failed");
+    }
+
+    if (_wifi->isAPMode()) {
+        setupCaptivePortal();
+    } else {
+        setupAPIRoutes();
+        setupStaticFiles();
+        setupOTA();
+    }
+
+    _server.begin();
+    Serial.printf("[web] Server started (mode: %s)\n",
+                  _wifi->isAPMode() ? "AP/captive" : "LAN");
+}
+
+void AppWebServer::setActionCallback(std::function<void(const String& action)> cb) {
+    _actionCb = cb;
+}
+
+bool AppWebServer::isOTAInProgress() {
+    return _otaInProgress;
+}
+
+void AppWebServer::setupCaptivePortal() {
+    // Serve setup page for all requests (captive portal behavior)
+    _server.on("/", HTTP_GET, [](AsyncWebServerRequest* request) {
+        request->send(LittleFS, "/setup.html", "text/html");
+    });
+
+    // Kick off initial async WiFi scan
+    WiFi.scanNetworks(true);
+
+    // Handle WiFi scan (non-blocking — returns cached results or "scanning" status)
+    _server.on("/api/wifi/scan", HTTP_GET, [](AsyncWebServerRequest* request) {
+        int n = WiFi.scanComplete();
+        if (n == WIFI_SCAN_RUNNING) {
+            // Scan in progress — tell client to retry
+            request->send(200, "application/json", "{\"scanning\":true}");
+            return;
+        }
+        if (n == WIFI_SCAN_FAILED) {
+            // No scan started or failed — kick one off
+            WiFi.scanNetworks(true);
+            request->send(200, "application/json", "{\"scanning\":true}");
+            return;
+        }
+
+        // Scan complete — return results
+        JsonDocument doc;
+        JsonArray arr = doc.to<JsonArray>();
+        for (int i = 0; i < n; i++) {
+            JsonObject net = arr.add<JsonObject>();
+            net["ssid"] = WiFi.SSID(i);
+            net["rssi"] = WiFi.RSSI(i);
+            net["secure"] = WiFi.encryptionType(i) != WIFI_AUTH_OPEN;
+        }
+        String response;
+        serializeJson(doc, response);
+
+        // Start a fresh scan for next request
+        WiFi.scanDelete();
+        WiFi.scanNetworks(true);
+
+        request->send(200, "application/json", response);
+    });
+
+    // Handle setup submission
+    _server.on("/api/setup", HTTP_POST, [](AsyncWebServerRequest* request) {
+        request->send(200);
+    }, nullptr, [this](AsyncWebServerRequest* request, uint8_t* data, size_t len,
+                        size_t index, size_t total) {
+        if (index + len == total) {
+            handlePostSetup(request, data, len);
+        }
+    });
+
+    // Captive portal redirect for all other paths
+    _server.onNotFound([](AsyncWebServerRequest* request) {
+        request->redirect("/");
+    });
+}
+
+void AppWebServer::setupAPIRoutes() {
+    _server.on("/api/status", HTTP_GET,
+        [this](AsyncWebServerRequest* req) { handleGetStatus(req); });
+
+    _server.on("/api/albums", HTTP_GET,
+        [this](AsyncWebServerRequest* req) { handleGetAlbums(req); });
+
+    _server.on("/api/albums/select", HTTP_POST,
+        [](AsyncWebServerRequest* req) { req->send(200); },
+        nullptr,
+        [this](AsyncWebServerRequest* req, uint8_t* data, size_t len,
+               size_t index, size_t total) {
+            if (index + len == total) handlePostAlbumsSelect(req, data, len);
+        });
+
+    _server.on("/api/settings", HTTP_GET,
+        [this](AsyncWebServerRequest* req) { handleGetSettings(req); });
+
+    _server.on("/api/settings", HTTP_POST,
+        [](AsyncWebServerRequest* req) { req->send(200); },
+        nullptr,
+        [this](AsyncWebServerRequest* req, uint8_t* data, size_t len,
+               size_t index, size_t total) {
+            if (index + len == total) handlePostSettings(req, data, len);
+        });
+
+    // Action endpoints
+    _server.on("/api/action/next", HTTP_POST,
+        [this](AsyncWebServerRequest* req) {
+            if (_actionCb) _actionCb("next");
+            req->send(200, "application/json", "{\"ok\":true}");
+        });
+
+    _server.on("/api/action/random", HTTP_POST,
+        [this](AsyncWebServerRequest* req) {
+            if (_actionCb) _actionCb("random");
+            req->send(200, "application/json", "{\"ok\":true}");
+        });
+
+    _server.on("/api/action/pause", HTTP_POST,
+        [this](AsyncWebServerRequest* req) {
+            if (_actionCb) _actionCb("pause");
+            req->send(200, "application/json", "{\"ok\":true}");
+        });
+
+    _server.on("/api/action/play", HTTP_POST,
+        [this](AsyncWebServerRequest* req) {
+            if (_actionCb) _actionCb("play");
+            req->send(200, "application/json", "{\"ok\":true}");
+        });
+
+    _server.on("/api/action/sleep", HTTP_POST,
+        [this](AsyncWebServerRequest* req) {
+            req->send(200, "application/json", "{\"ok\":true}");
+            delay(100);
+            Settings s = _settings->get();
+            _power->enterDeepSleep(s.interval_min);
+        });
+
+    // Test Immich connectivity
+    _server.on("/api/test-connection", HTTP_POST,
+        [this](AsyncWebServerRequest* req) {
+            Settings s = _settings->get();
+            Serial.printf("[web] Testing connection to: %s (key: %s...)\n",
+                          s.immich_url.c_str(),
+                          s.immich_key.substring(0, 8).c_str());
+
+            // Reinitialize immich client with current settings
+            _immich->begin(s.immich_url, s.immich_key);
+            auto albums = _immich->fetchAlbums();
+
+            JsonDocument doc;
+            if (!albums.empty()) {
+                doc["ok"] = true;
+                doc["msg"] = String("Connected! Found ") + String(albums.size()) + " albums.";
+            } else {
+                doc["ok"] = false;
+                doc["msg"] = "Failed to connect. Check URL and API key.";
+            }
+            String response;
+            serializeJson(doc, response);
+            req->send(200, "application/json", response);
+        });
+
+    _server.on("/api/action/sync-time", HTTP_POST,
+        [this](AsyncWebServerRequest* req) {
+            _wifi->syncNTP();
+            req->send(200, "application/json", "{\"ok\":true,\"msg\":\"RTC synced\"}");
+        });
+
+    // Wake log endpoints
+    _server.on("/api/log", HTTP_GET,
+        [](AsyncWebServerRequest* req) {
+            if (LittleFS.exists("/wake_log.csv")) {
+                req->send(LittleFS, "/wake_log.csv", "text/csv");
+            } else {
+                req->send(200, "text/csv", "");
+            }
+        });
+
+    _server.on("/api/log/clear", HTTP_POST,
+        [](AsyncWebServerRequest* req) {
+            LittleFS.remove("/wake_log.csv");
+            req->send(200, "application/json", "{\"ok\":true,\"msg\":\"Log cleared\"}");
+        });
+
+    _server.on("/api/action/reboot", HTTP_POST,
+        [](AsyncWebServerRequest* req) {
+            req->send(200, "application/json", "{\"ok\":true,\"msg\":\"Rebooting...\"}");
+            delay(500);
+            ESP.restart();
+        });
+}
+
+void AppWebServer::setupStaticFiles() {
+    _server.serveStatic("/", LittleFS, "/").setDefaultFile("index.html");
+}
+
+void AppWebServer::setupOTA() {
+    _server.on("/api/firmware", HTTP_POST,
+        [this](AsyncWebServerRequest* request) {
+            _otaInProgress = false;
+            bool success = !Update.hasError();
+            request->send(200, "application/json",
+                success ? "{\"ok\":true,\"msg\":\"Rebooting...\"}"
+                        : "{\"ok\":false,\"msg\":\"Update failed\"}");
+            if (success) {
+                delay(500);
+                ESP.restart();
+            }
+        },
+        [this](AsyncWebServerRequest* request, const String& filename,
+               size_t index, uint8_t* data, size_t len, bool final) {
+            if (index == 0) {
+                _otaInProgress = true;
+                Serial.printf("[web] OTA start: %s\n", filename.c_str());
+                if (!Update.begin(UPDATE_SIZE_UNKNOWN, U_FLASH)) {
+                    Serial.println("[web] OTA begin failed");
+                }
+            }
+            if (Update.isRunning()) {
+                Update.write(data, len);
+            }
+            if (final) {
+                if (Update.end(true)) {
+                    Serial.printf("[web] OTA complete: %u bytes\n", index + len);
+                } else {
+                    Serial.println("[web] OTA finalize failed");
+                    Update.printError(Serial);
+                }
+            }
+        });
+}
+
+void AppWebServer::handleGetStatus(AsyncWebServerRequest* request) {
+    JsonDocument doc;
+    doc["battery"] = _power->getBatteryPercent();
+    doc["charging"] = _power->isCharging();
+    doc["wifi_rssi"] = _wifi->getRSSI();
+    doc["ip"] = _wifi->getIP();
+    doc["uptime"] = millis() / 1000;
+    doc["free_heap"] = ESP.getFreeHeap();
+    doc["free_psram"] = ESP.getFreePsram();
+
+    String response;
+    serializeJson(doc, response);
+    request->send(200, "application/json", response);
+}
+
+void AppWebServer::handleGetAlbums(AsyncWebServerRequest* request) {
+    auto albums = _immich->fetchAlbums();
+    JsonDocument doc;
+    JsonArray arr = doc.to<JsonArray>();
+    for (auto& album : albums) {
+        JsonObject obj = arr.add<JsonObject>();
+        obj["id"] = album.id;
+        obj["title"] = album.title;
+        obj["assetCount"] = album.assetCount;
+    }
+    String response;
+    serializeJson(doc, response);
+    request->send(200, "application/json", response);
+}
+
+void AppWebServer::handlePostAlbumsSelect(AsyncWebServerRequest* request,
+                                           uint8_t* data, size_t len) {
+    String body = String((char*)data).substring(0, len);
+    JsonDocument doc;
+    if (deserializeJson(doc, body)) {
+        request->send(400, "application/json", "{\"error\":\"Invalid JSON\"}");
+        return;
+    }
+    String albumsJson;
+    serializeJson(doc["album_ids"], albumsJson);
+    _settings->saveField("albums_json", albumsJson.c_str());
+    if (_actionCb) _actionCb("albums_changed");
+    request->send(200, "application/json", "{\"ok\":true}");
+}
+
+void AppWebServer::handleGetSettings(AsyncWebServerRequest* request) {
+    Settings s = _settings->get();
+    JsonDocument doc;
+    doc["interval_min"] = s.interval_min;
+    doc["cycle_mode"] = static_cast<uint8_t>(s.cycle_mode);
+    doc["img_quality"] = static_cast<uint8_t>(s.img_quality);
+    doc["meta_flags"] = s.meta_flags;
+    doc["meta_pos"] = static_cast<uint8_t>(s.meta_pos);
+    doc["date_fmt"] = s.date_fmt;
+    doc["time_fmt"] = s.time_fmt;
+    doc["pipeline_mode"] = s.pipeline_mode;
+    doc["dither_noise"] = s.dither_noise;
+    doc["meta_translucent"] = s.meta_translucent;
+    doc["led_brightness"] = s.led_brightness;
+    doc["show_battery"] = s.show_battery;
+    doc["immich_url"] = s.immich_url;
+    doc["immich_key"] = s.immich_key;
+    doc["albums_json"] = s.albums_json;
+    doc["timer_batch_size"] = s.timer_batch_size;
+
+    String response;
+    serializeJson(doc, response);
+    request->send(200, "application/json", response);
+}
+
+void AppWebServer::handlePostSettings(AsyncWebServerRequest* request,
+                                       uint8_t* data, size_t len) {
+    String body = String((char*)data).substring(0, len);
+    JsonDocument doc;
+    if (deserializeJson(doc, body)) {
+        request->send(400, "application/json", "{\"error\":\"Invalid JSON\"}");
+        return;
+    }
+
+    Settings s = _settings->get();
+
+    if (!doc["interval_min"].isNull()) {
+        uint8_t v = doc["interval_min"];
+        s.interval_min = constrain(v, 1, 60);
+    }
+    if (!doc["cycle_mode"].isNull()) s.cycle_mode = static_cast<CycleMode>((uint8_t)doc["cycle_mode"]);
+    if (!doc["img_quality"].isNull()) s.img_quality = static_cast<ImageQuality>((uint8_t)doc["img_quality"]);
+    if (!doc["meta_flags"].isNull()) s.meta_flags = doc["meta_flags"];
+    if (!doc["meta_pos"].isNull()) s.meta_pos = static_cast<MetaPosition>((uint8_t)doc["meta_pos"]);
+    if (!doc["date_fmt"].isNull()) s.date_fmt = doc["date_fmt"].as<String>();
+    if (!doc["time_fmt"].isNull()) s.time_fmt = doc["time_fmt"].as<String>();
+    if (!doc["pipeline_mode"].isNull()) s.pipeline_mode = doc["pipeline_mode"];
+    if (!doc["dither_noise"].isNull()) s.dither_noise = doc["dither_noise"];
+    if (!doc["meta_translucent"].isNull()) s.meta_translucent = doc["meta_translucent"];
+    if (!doc["led_brightness"].isNull()) s.led_brightness = doc["led_brightness"];
+    if (!doc["show_battery"].isNull()) s.show_battery = doc["show_battery"];
+    if (!doc["immich_url"].isNull()) s.immich_url = doc["immich_url"].as<String>();
+    if (!doc["immich_key"].isNull()) s.immich_key = doc["immich_key"].as<String>();
+    if (!doc["timer_batch_size"].isNull()) {
+        uint8_t v = doc["timer_batch_size"];
+        s.timer_batch_size = constrain(v, 1, 50);
+    }
+
+    _settings->save(s);
+    request->send(200, "application/json", "{\"ok\":true}");
+}
+
+void AppWebServer::handlePostSetup(AsyncWebServerRequest* request,
+                                    uint8_t* data, size_t len) {
+    String body = String((char*)data).substring(0, len);
+    JsonDocument doc;
+    if (deserializeJson(doc, body)) {
+        request->send(400, "application/json", "{\"error\":\"Invalid JSON\"}");
+        return;
+    }
+
+    Settings s = _settings->get();
+    s.wifi_ssid = doc["wifi_ssid"].as<String>();
+    s.wifi_pass = doc["wifi_pass"].as<String>();
+    s.immich_url = doc["immich_url"] | DEFAULT_IMMICH_URL;
+    s.immich_key = doc["immich_key"].as<String>();
+    _settings->save(s);
+
+    request->send(200, "application/json", "{\"ok\":true,\"msg\":\"Rebooting...\"}");
+    delay(1000);
+    ESP.restart();
+}

src/web_server.h

@@ -0,0 +1,40 @@
+#pragma once
+
+#include <Arduino.h>
+#include <ESPAsyncWebServer.h>
+#include <functional>
+#include "settings.h"
+
+class ImmichClient;
+class PowerManager;
+class WiFiManager;
+
+class AppWebServer {
+public:
+    void begin(SettingsManager& settings, ImmichClient& immich,
+               PowerManager& power, WiFiManager& wifi);
+    void setActionCallback(std::function<void(const String& action)> cb);
+    bool isOTAInProgress();
+
+private:
+    AsyncWebServer _server{80};
+    SettingsManager* _settings = nullptr;
+    ImmichClient* _immich = nullptr;
+    PowerManager* _power = nullptr;
+    WiFiManager* _wifi = nullptr;
+    std::function<void(const String& action)> _actionCb;
+    bool _otaInProgress = false;
+
+    void setupCaptivePortal();
+    void setupAPIRoutes();
+    void setupStaticFiles();
+    void setupOTA();
+
+    void handleGetStatus(AsyncWebServerRequest* request);
+    void handleGetAlbums(AsyncWebServerRequest* request);
+    void handlePostAlbumsSelect(AsyncWebServerRequest* request, uint8_t* data, size_t len);
+    void handleGetSettings(AsyncWebServerRequest* request);
+    void handlePostSettings(AsyncWebServerRequest* request, uint8_t* data, size_t len);
+    void handlePostAction(AsyncWebServerRequest* request);
+    void handlePostSetup(AsyncWebServerRequest* request, uint8_t* data, size_t len);
+};

src/wifi_manager.cpp

@@ -0,0 +1,138 @@
+#include "wifi_manager.h"
+#include <WiFi.h>
+#include <ESPmDNS.h>
+#include <M5Unified.h>
+#include <time.h>
+#include <sys/time.h>
+#include "config.h"
+
+void WiFiManager::begin(SettingsManager& settings, bool minimal) {
+    _settings = &settings;
+
+    if (!_settings->isProvisioned()) {
+        Serial.println("[wifi] Not provisioned — starting AP");
+        startAP();
+        return;
+    }
+
+    startStation(minimal);
+}
+
+bool WiFiManager::isConnected() {
+    return WiFi.status() == WL_CONNECTED;
+}
+
+bool WiFiManager::isAPMode() {
+    return _apMode;
+}
+
+String WiFiManager::getIP() {
+    if (_apMode) {
+        return WiFi.softAPIP().toString();
+    }
+    return WiFi.localIP().toString();
+}
+
+int WiFiManager::getRSSI() {
+    if (_apMode) return 0;
+    return WiFi.RSSI();
+}
+
+void WiFiManager::startAP() {
+    WiFi.disconnect(true);
+    WiFi.mode(WIFI_AP);
+    WiFi.softAP("PaperColor-Setup");
+    _apMode = true;
+    Serial.printf("[wifi] AP started: PaperColor-Setup, IP: %s\n",
+                  WiFi.softAPIP().toString().c_str());
+}
+
+void WiFiManager::startStation(bool minimal) {
+    Settings s = _settings->get();
+    WiFi.disconnect(true);
+    WiFi.mode(WIFI_STA);
+    _apMode = false;
+
+    Serial.printf("[wifi] Connecting to: %s%s\n", s.wifi_ssid.c_str(),
+                  minimal ? " (minimal)" : "");
+
+    for (_retryCount = 0; _retryCount < WIFI_MAX_RETRIES; _retryCount++) {
+        if (attemptConnection(s.wifi_ssid, s.wifi_pass)) {
+            Serial.printf("[wifi] Connected! IP: %s, RSSI: %d\n",
+                          WiFi.localIP().toString().c_str(), WiFi.RSSI());
+
+            if (minimal) {
+                // Deep sleep wake path: skip blocking NTP wait and mDNS to
+                // minimize active time. Still call configTime() to initialize
+                // the DNS resolver (required for HTTPS hostname resolution).
+                configTime(0, 0, "pool.ntp.org", "time.nist.gov");
+                return;
+            }
+
+            WiFi.setSleep(WIFI_PS_MIN_MODEM);
+            syncNTP();
+            setupMDNS("papercolor");
+            return;
+        }
+        Serial.printf("[wifi] Attempt %d/%d failed\n", _retryCount + 1, WIFI_MAX_RETRIES);
+    }
+
+    Serial.println("[wifi] All attempts failed — falling back to AP mode");
+    startAP();
+}
+
+void WiFiManager::setupMDNS(const char* hostname) {
+    if (MDNS.begin(hostname)) {
+        MDNS.addService("http", "tcp", 80);
+        Serial.printf("[wifi] mDNS: %s.local\n", hostname);
+    } else {
+        Serial.println("[wifi] mDNS failed to start");
+    }
+}
+
+bool WiFiManager::attemptConnection(const String& ssid, const String& pass) {
+    WiFi.begin(ssid.c_str(), pass.c_str());
+
+    unsigned long start = millis();
+    while (WiFi.status() != WL_CONNECTED) {
+        if (millis() - start > WIFI_CONNECT_TIMEOUT_MS) {
+            return false;
+        }
+        delay(100);
+    }
+    return true;
+}
+
+void WiFiManager::syncNTP() {
+    configTime(0, 0, "pool.ntp.org", "time.nist.gov");
+
+    // Wait up to 5 seconds for NTP sync
+    unsigned long start = millis();
+    time_t now = 0;
+    while (now < 1600000000 && (millis() - start) < 5000) {
+        delay(100);
+        time(&now);
+    }
+
+    if (now < 1600000000) {
+        Serial.println("[wifi] NTP sync timed out");
+        return;
+    }
+
+    // Write synced time to hardware RTC
+    struct tm t;
+    gmtime_r(&now, &t);
+
+    m5::rtc_datetime_t dt;
+    dt.date.year = t.tm_year + 1900;
+    dt.date.month = t.tm_mon + 1;
+    dt.date.date = t.tm_mday;
+    dt.time.hours = t.tm_hour;
+    dt.time.minutes = t.tm_min;
+    dt.time.seconds = t.tm_sec;
+    M5.Rtc.setDateTime(dt);
+
+    Serial.printf("[wifi] NTP synced: %04d-%02d-%02d %02d:%02d:%02d UTC, written to RTC\n",
+                  dt.date.year, dt.date.month, dt.date.date,
+                  dt.time.hours, dt.time.minutes, dt.time.seconds);
+}

src/wifi_manager.h

@@ -0,0 +1,24 @@
+#pragma once
+
+#include <Arduino.h>
+#include "settings.h"
+
+class WiFiManager {
+public:
+    void begin(SettingsManager& settings, bool minimal = false);
+    bool isConnected();
+    bool isAPMode();
+    String getIP();
+    int getRSSI();
+    void startAP();
+    void startStation(bool minimal = false);
+    void setupMDNS(const char* hostname);
+    void syncNTP();
+
+private:
+    SettingsManager* _settings = nullptr;
+    bool _apMode = false;
+    int _retryCount = 0;
+
+    bool attemptConnection(const String& ssid, const String& pass);
+};

test/README.md

@@ -0,0 +1,44 @@
+# Testing
+
+## Native Tests (host machine)
+
+Run algorithm tests that don't require hardware:
+
+```bash
+pio test -e native
+```
+
+Tests:
+
+- `test_photo_queue.cpp` — queue cycling, favorites weighting
+- `test_image_pipeline.cpp` — nearest color, dithering correctness
+
+## On-Device Testing
+
+Flash and monitor:
+
+```bash
+pio run -e m5stack-papercolor -t upload && pio device monitor
+```
+
+### Verification Checklist
+
+- [ ] Device boots and prints version to serial
+- [ ] AP mode activates on first boot
+- [ ] Captive portal serves setup page at 192.168.4.1
+- [ ] WiFi credentials save and device reboots to station mode
+- [ ] mDNS resolves at papercolor.local
+- [ ] Web UI dashboard shows battery/WiFi/uptime
+- [ ] Albums page lists Immich albums
+- [ ] Album selection persists across reboots
+- [ ] Photos download and display correctly
+- [ ] Portrait photos pair side-by-side
+- [ ] Slideshow advances at configured interval
+- [ ] BTN_UP: next photo (LED flashes white)
+- [ ] BTN_TOP: random photo (LED flashes white)
+- [ ] BTN_DOWN: pause/play toggle
+- [ ] BTN_TOP+BTN_DOWN 3s: deep sleep
+- [ ] BTN_UP 5s: factory reset
+- [ ] Battery LED: orange at 25%, red at 10%
+- [ ] OTA upload succeeds via web UI
+- [ ] Device recovers from WiFi disconnect (reconnect on next cycle)

test/test_native/test_image_pipeline.cpp

@@ -0,0 +1,294 @@
+#include <unity.h>
+#include <cstdint>
+#include <cmath>
+#include <cstdlib>
+#include <cstring>
+#include <climits>
+
+// Calibrated Spectra 6 palette (matches PALETTE_CALIBRATED in image_pipeline.cpp)
+struct Color { uint8_t r, g, b; };
+
+static const Color PALETTE[6] = {
+    {0x1F, 0x22, 0x26},  // Black  -> dark gray
+    {0xB9, 0xC7, 0xC9},  // White  -> light gray-blue
+    {0x62, 0x20, 0x1E},  // Red    -> dark red/brown
+    {0x35, 0x56, 0x3A},  // Green  -> dark forest green
+    {0x23, 0x3F, 0x8E},  // Blue   -> dark navy
+    {0xC1, 0xBB, 0x1E}   // Yellow -> olive/mustard
+};
+
+// Find nearest palette color (Rec. 709 luminance-weighted RGB distance)
+uint8_t findNearestColor(int r, int g, int b) {
+    uint8_t best = 0;
+    int32_t bestDist = INT32_MAX;
+    for (int i = 0; i < 6; i++) {
+        int dr = r - PALETTE[i].r;
+        int dg = g - PALETTE[i].g;
+        int db = b - PALETTE[i].b;
+        int32_t dist = 2126 * dr * dr + 7152 * dg * dg + 722 * db * db;
+        if (dist < bestDist) {
+            bestDist = dist;
+            best = static_cast<uint8_t>(i);
+        }
+    }
+    return best;
+}
+
+// Floyd-Steinberg dithering on a small test buffer
+void ditherBuffer(uint8_t* rgb, int width, int height, uint8_t* output) {
+    // Working buffer with int16_t to handle error diffusion overflow
+    int16_t* work = (int16_t*)malloc(width * height * 3 * sizeof(int16_t));
+    for (int i = 0; i < width * height * 3; i++) {
+        work[i] = rgb[i];
+    }
+
+    for (int y = 0; y < height; y++) {
+        for (int x = 0; x < width; x++) {
+            int idx = (y * width + x) * 3;
+            int r = work[idx];
+            int g = work[idx + 1];
+            int b = work[idx + 2];
+
+            // Clamp
+            r = r < 0 ? 0 : (r > 255 ? 255 : r);
+            g = g < 0 ? 0 : (g > 255 ? 255 : g);
+            b = b < 0 ? 0 : (b > 255 ? 255 : b);
+
+            uint8_t nearest = findNearestColor(r, g, b);
+            output[y * width + x] = nearest;
+
+            // Error
+            int errR = r - PALETTE[nearest].r;
+            int errG = g - PALETTE[nearest].g;
+            int errB = b - PALETTE[nearest].b;
+
+            // Distribute error (Floyd-Steinberg weights: 7/16, 3/16, 5/16, 1/16)
+            if (x + 1 < width) {
+                int ni = (y * width + (x + 1)) * 3;
+                work[ni]     += errR * 7 / 16;
+                work[ni + 1] += errG * 7 / 16;
+                work[ni + 2] += errB * 7 / 16;
+            }
+            if (y + 1 < height) {
+                if (x > 0) {
+                    int ni = ((y + 1) * width + (x - 1)) * 3;
+                    work[ni]     += errR * 3 / 16;
+                    work[ni + 1] += errG * 3 / 16;
+                    work[ni + 2] += errB * 3 / 16;
+                }
+                {
+                    int ni = ((y + 1) * width + x) * 3;
+                    work[ni]     += errR * 5 / 16;
+                    work[ni + 1] += errG * 5 / 16;
+                    work[ni + 2] += errB * 5 / 16;
+                }
+                if (x + 1 < width) {
+                    int ni = ((y + 1) * width + (x + 1)) * 3;
+                    work[ni]     += errR * 1 / 16;
+                    work[ni + 1] += errG * 1 / 16;
+                    work[ni + 2] += errB * 1 / 16;
+                }
+            }
+        }
+    }
+    free(work);
+}
+
+void test_nearest_color_black() {
+    TEST_ASSERT_EQUAL(0, findNearestColor(0, 0, 0));
+}
+
+void test_nearest_color_white() {
+    TEST_ASSERT_EQUAL(1, findNearestColor(255, 255, 255));
+}
+
+void test_nearest_color_red() {
+    TEST_ASSERT_EQUAL(2, findNearestColor(180, 20, 20));
+}
+
+void test_nearest_color_green() {
+    TEST_ASSERT_EQUAL(3, findNearestColor(20, 140, 20));
+}
+
+void test_nearest_color_blue() {
+    TEST_ASSERT_EQUAL(4, findNearestColor(20, 20, 180));
+}
+
+void test_nearest_color_yellow() {
+    TEST_ASSERT_EQUAL(5, findNearestColor(200, 180, 20));
+}
+
+void test_dither_solid_black() {
+    const int W = 4, H = 4;
+    uint8_t rgb[W * H * 3] = {0};  // All black
+    uint8_t output[W * H];
+    ditherBuffer(rgb, W, H, output);
+    for (int i = 0; i < W * H; i++) {
+        TEST_ASSERT_EQUAL(0, output[i]);  // All should be black
+    }
+}
+
+void test_dither_solid_white() {
+    const int W = 4, H = 4;
+    uint8_t rgb[W * H * 3];
+    memset(rgb, 255, sizeof(rgb));  // All white
+    uint8_t output[W * H];
+    ditherBuffer(rgb, W, H, output);
+    for (int i = 0; i < W * H; i++) {
+        TEST_ASSERT_EQUAL(1, output[i]);  // All should be white
+    }
+}
+
+void test_dither_produces_valid_indices() {
+    const int W = 8, H = 8;
+    uint8_t rgb[W * H * 3];
+    // Fill with mid-gray
+    for (int i = 0; i < W * H * 3; i++) rgb[i] = 128;
+    uint8_t output[W * H];
+    ditherBuffer(rgb, W, H, output);
+    for (int i = 0; i < W * H; i++) {
+        TEST_ASSERT_TRUE(output[i] < 6);  // Valid palette index
+    }
+}
+
+// Include the actual blue noise texture for testing
+#include "../../src/blue_noise.h"
+
+static constexpr float TEST_BLUE_NOISE_STRENGTH = 32.0f;
+
+// Floyd-Steinberg dither with blue noise threshold modulation
+void ditherBufferWithBlueNoise(uint8_t* rgb, int width, int height, uint8_t* output) {
+    int16_t* work = (int16_t*)malloc(width * height * 3 * sizeof(int16_t));
+    for (int i = 0; i < width * height * 3; i++) {
+        work[i] = rgb[i];
+    }
+
+    for (int y = 0; y < height; y++) {
+        for (int x = 0; x < width; x++) {
+            int idx = (y * width + x) * 3;
+            int r = work[idx];
+            int g = work[idx + 1];
+            int b = work[idx + 2];
+
+            r = r < 0 ? 0 : (r > 255 ? 255 : r);
+            g = g < 0 ? 0 : (g > 255 ? 255 : g);
+            b = b < 0 ? 0 : (b > 255 ? 255 : b);
+
+            // Apply blue noise perturbation
+            uint8_t noise = pgm_read_byte(&BLUE_NOISE_64[(y & 63) * 64 + (x & 63)]);
+            float nf = ((float)noise - 128.0f) * (TEST_BLUE_NOISE_STRENGTH / 128.0f);
+            int rn = r + (int)nf;
+            int gn = g + (int)nf;
+            int bn = b + (int)nf;
+            rn = rn < 0 ? 0 : (rn > 255 ? 255 : rn);
+            gn = gn < 0 ? 0 : (gn > 255 ? 255 : gn);
+            bn = bn < 0 ? 0 : (bn > 255 ? 255 : bn);
+
+            uint8_t nearest = findNearestColor(rn, gn, bn);
+            output[y * width + x] = nearest;
+
+            // Error uses original r,g,b (energy conservation)
+            int errR = r - PALETTE[nearest].r;
+            int errG = g - PALETTE[nearest].g;
+            int errB = b - PALETTE[nearest].b;
+
+            if (x + 1 < width) {
+                int ni = (y * width + (x + 1)) * 3;
+                work[ni]     += errR * 7 / 16;
+                work[ni + 1] += errG * 7 / 16;
+                work[ni + 2] += errB * 7 / 16;
+            }
+            if (y + 1 < height) {
+                if (x > 0) {
+                    int ni = ((y + 1) * width + (x - 1)) * 3;
+                    work[ni]     += errR * 3 / 16;
+                    work[ni + 1] += errG * 3 / 16;
+                    work[ni + 2] += errB * 3 / 16;
+                }
+                {
+                    int ni = ((y + 1) * width + x) * 3;
+                    work[ni]     += errR * 5 / 16;
+                    work[ni + 1] += errG * 5 / 16;
+                    work[ni + 2] += errB * 5 / 16;
+                }
+                if (x + 1 < width) {
+                    int ni = ((y + 1) * width + (x + 1)) * 3;
+                    work[ni]     += errR * 1 / 16;
+                    work[ni + 1] += errG * 1 / 16;
+                    work[ni + 2] += errB * 1 / 16;
+                }
+            }
+        }
+    }
+    free(work);
+}
+
+void test_blue_noise_breaks_pattern_regularity() {
+    // Use a 16x16 dark gray patch — just above the black palette value.
+    // Standard F-S produces highly regular dot patterns in this region.
+    const int W = 16, H = 16;
+    uint8_t rgb[W * H * 3];
+    memset(rgb, 45, sizeof(rgb));  // Dark gray (45,45,45) — triggers error accumulation
+
+    uint8_t output_standard[W * H];
+    uint8_t output_blue_noise[W * H];
+
+    // Copy rgb since ditherBuffer modifies working buffer
+    uint8_t rgb_copy[W * H * 3];
+    memcpy(rgb_copy, rgb, sizeof(rgb));
+
+    ditherBuffer(rgb, W, H, output_standard);
+    ditherBufferWithBlueNoise(rgb_copy, W, H, output_blue_noise);
+
+    // Both should produce valid palette indices
+    for (int i = 0; i < W * H; i++) {
+        TEST_ASSERT_TRUE(output_standard[i] < 6);
+        TEST_ASSERT_TRUE(output_blue_noise[i] < 6);
+    }
+
+    // Count unique rows in each output to measure pattern regularity.
+    // Standard F-S in uniform areas tends to produce repeating row patterns.
+    // Blue noise should produce more unique rows (less periodic).
+    int unique_standard = 0;
+    int unique_blue_noise = 0;
+
+    for (int y = 0; y < H; y++) {
+        bool is_duplicate = false;
+        for (int prev = 0; prev < y; prev++) {
+            if (memcmp(&output_standard[y * W], &output_standard[prev * W], W) == 0) {
+                is_duplicate = true;
+                break;
+            }
+        }
+        if (!is_duplicate) unique_standard++;
+    }
+
+    for (int y = 0; y < H; y++) {
+        bool is_duplicate = false;
+        for (int prev = 0; prev < y; prev++) {
+            if (memcmp(&output_blue_noise[y * W], &output_blue_noise[prev * W], W) == 0) {
+                is_duplicate = true;
+                break;
+            }
+        }
+        if (!is_duplicate) unique_blue_noise++;
+    }
+
+    // Blue noise version should have at least as many unique rows as standard.
+    // In practice it should have more (the whole point of the feature).
+    TEST_ASSERT_GREATER_OR_EQUAL(unique_standard, unique_blue_noise);
+}
+
+void test_blue_noise_dither_valid_indices() {
+    const int W = 16, H = 16;
+    uint8_t rgb[W * H * 3];
+    // Test across different gray levels
+    for (int level = 0; level < 256; level += 32) {
+        memset(rgb, level, sizeof(rgb));
+        uint8_t output[W * H];
+        ditherBufferWithBlueNoise(rgb, W, H, output);
+        for (int i = 0; i < W * H; i++) {
+            TEST_ASSERT_TRUE(output[i] < 6);
+        }
+    }
+}

test/test_native/test_photo_queue.cpp

@@ -0,0 +1,129 @@
+#include <unity.h>
+#include <vector>
+#include <algorithm>
+#include <cstdlib>
+#include <cstring>
+
+// Minimal test of queue cycling logic (extracted, platform-independent)
+// We test the shuffling and cycling algorithms without hardware dependencies
+
+struct QueueState {
+    std::vector<std::string> ids;
+    size_t cursor;
+};
+
+// Simulate random cycling: advance through shuffled list
+std::string advanceRandom(QueueState& state) {
+    if (state.ids.empty()) return "";
+    if (state.cursor >= state.ids.size()) {
+        state.cursor = 0;  // Wrap around (would reshuffle in real impl)
+    }
+    return state.ids[state.cursor++];
+}
+
+// Simulate chronological: just advance sequentially (assumes pre-sorted)
+std::string advanceChrono(QueueState& state) {
+    if (state.ids.empty()) return "";
+    if (state.cursor >= state.ids.size()) {
+        state.cursor = 0;
+    }
+    return state.ids[state.cursor++];
+}
+
+// Favorites weighting: insert duplicates
+std::vector<std::string> applyFavoritesWeight(
+    const std::vector<std::string>& all,
+    const std::vector<std::string>& favorites,
+    int weight) {
+
+    std::vector<std::string> result = all;
+    for (const auto& fav : favorites) {
+        for (int i = 1; i < weight; i++) {
+            result.push_back(fav);
+        }
+    }
+    return result;
+}
+
+void test_advance_random_no_repeats_until_wrap() {
+    QueueState state;
+    state.ids = {"a", "b", "c", "d", "e"};
+    state.cursor = 0;
+
+    std::vector<std::string> seen;
+    for (size_t i = 0; i < state.ids.size(); i++) {
+        std::string id = advanceRandom(state);
+        // Should not have seen this one yet
+        TEST_ASSERT_TRUE(std::find(seen.begin(), seen.end(), id) == seen.end());
+        seen.push_back(id);
+    }
+    TEST_ASSERT_EQUAL(5, seen.size());
+}
+
+void test_advance_wraps_at_end() {
+    QueueState state;
+    state.ids = {"a", "b", "c"};
+    state.cursor = 0;
+
+    advanceRandom(state);  // a
+    advanceRandom(state);  // b
+    advanceRandom(state);  // c
+    std::string wrapped = advanceRandom(state);  // wraps to a
+    TEST_ASSERT_EQUAL_STRING("a", wrapped.c_str());
+}
+
+void test_empty_queue_returns_empty() {
+    QueueState state;
+    state.cursor = 0;
+    std::string result = advanceRandom(state);
+    TEST_ASSERT_EQUAL_STRING("", result.c_str());
+}
+
+void test_favorites_weighting() {
+    std::vector<std::string> all = {"a", "b", "c"};
+    std::vector<std::string> favs = {"b"};
+    auto weighted = applyFavoritesWeight(all, favs, 3);
+    // "b" should appear 3 times total (1 original + 2 extra)
+    int count = 0;
+    for (const auto& id : weighted) {
+        if (id == "b") count++;
+    }
+    TEST_ASSERT_EQUAL(3, count);
+    TEST_ASSERT_EQUAL(5, weighted.size());  // 3 original + 2 extra
+}
+
+void test_nearest_color_black();
+void test_nearest_color_white();
+void test_nearest_color_red();
+void test_nearest_color_green();
+void test_nearest_color_blue();
+void test_nearest_color_yellow();
+void test_dither_solid_black();
+void test_dither_solid_white();
+void test_dither_produces_valid_indices();
+void test_blue_noise_breaks_pattern_regularity();
+void test_blue_noise_dither_valid_indices();
+
+void setUp() {}
+void tearDown() {}
+
+int main() {
+    UNITY_BEGIN();
+    RUN_TEST(test_advance_random_no_repeats_until_wrap);
+    RUN_TEST(test_advance_wraps_at_end);
+    RUN_TEST(test_empty_queue_returns_empty);
+    RUN_TEST(test_favorites_weighting);
+    RUN_TEST(test_nearest_color_black);
+    RUN_TEST(test_nearest_color_white);
+    RUN_TEST(test_nearest_color_red);
+    RUN_TEST(test_nearest_color_green);
+    RUN_TEST(test_nearest_color_blue);
+    RUN_TEST(test_nearest_color_yellow);
+    RUN_TEST(test_dither_solid_black);
+    RUN_TEST(test_dither_solid_white);
+    RUN_TEST(test_dither_produces_valid_indices);
+    RUN_TEST(test_blue_noise_breaks_pattern_regularity);
+    RUN_TEST(test_blue_noise_dither_valid_indices);
+    UNITY_END();
+    return 0;
+}

tools/log-compare.html

@@ -0,0 +1,506 @@
+<!DOCTYPE html>
+<html lang="en">
+<head>
+    <meta charset="UTF-8">
+    <meta name="viewport" content="width=device-width, initial-scale=1.0">
+    <title>PaperColor Battery Comparison</title>
+    <script src="./vendor/chart.umd.min.js"></script>
+    <script src="./vendor/chartjs-adapter-date-fns.bundle.min.js"></script>
+    <style>
+        :root {
+            --bg: #f8fafc;
+            --card: #ffffff;
+            --text: #1e293b;
+            --muted: #64748b;
+            --border: #e2e8f0;
+            --accent: #2563eb;
+            --accent2: #d97706;
+            --success: #16a34a;
+            --danger: #dc2626;
+        }
+        @media (prefers-color-scheme: dark) {
+            :root {
+                --bg: #0f172a;
+                --card: #1e293b;
+                --text: #f1f5f9;
+                --muted: #94a3b8;
+                --border: #334155;
+                --accent: #60a5fa;
+                --accent2: #fbbf24;
+                --success: #4ade80;
+                --danger: #f87171;
+            }
+        }
+        * { box-sizing: border-box; margin: 0; padding: 0; }
+        body {
+            font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
+            background: var(--bg);
+            color: var(--text);
+            line-height: 1.5;
+            padding: 24px;
+        }
+        h1 { font-size: 22px; margin-bottom: 4px; }
+        h2 { font-size: 16px; color: var(--muted); margin-bottom: 20px; }
+        h3 { font-size: 14px; color: var(--muted); margin-bottom: 8px; text-transform: uppercase; letter-spacing: 0.5px; }
+
+        .drop-row {
+            display: grid;
+            grid-template-columns: 1fr 1fr;
+            gap: 16px;
+            margin-bottom: 24px;
+        }
+        @media (max-width: 700px) { .drop-row { grid-template-columns: 1fr; } }
+
+        .drop-zone {
+            border: 2px dashed var(--border);
+            border-radius: 12px;
+            padding: 32px 20px;
+            text-align: center;
+            cursor: pointer;
+            transition: border-color 0.2s, background 0.2s;
+        }
+        .drop-zone:hover, .drop-zone.dragover {
+            border-color: var(--accent);
+            background: color-mix(in srgb, var(--accent) 5%, transparent);
+        }
+        .drop-zone.loaded {
+            border-color: var(--success);
+            border-style: solid;
+        }
+        .drop-zone input { display: none; }
+        .drop-zone p { color: var(--muted); font-size: 14px; }
+        .drop-zone p strong { color: var(--text); }
+        .drop-zone .label { font-size: 12px; text-transform: uppercase; letter-spacing: 0.5px; font-weight: 600; margin-bottom: 8px; }
+        .drop-zone .label-a { color: var(--accent); }
+        .drop-zone .label-b { color: var(--accent2); }
+        .drop-zone .meta { font-size: 12px; color: var(--muted); margin-top: 8px; }
+
+        .hidden { display: none !important; }
+
+        .summary {
+            display: grid;
+            grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
+            gap: 12px;
+            margin-bottom: 24px;
+        }
+        .stat-card {
+            background: var(--card);
+            border: 1px solid var(--border);
+            border-radius: 8px;
+            padding: 14px 16px;
+        }
+        .stat-card .label { font-size: 12px; color: var(--muted); text-transform: uppercase; letter-spacing: 0.5px; }
+        .stat-card .values { display: flex; gap: 16px; margin-top: 4px; align-items: baseline; }
+        .stat-card .val-a { font-size: 18px; font-weight: 600; color: var(--accent); }
+        .stat-card .val-b { font-size: 18px; font-weight: 600; color: var(--accent2); }
+        .stat-card .val-delta { font-size: 14px; font-weight: 500; }
+        .stat-card .better { color: var(--success); }
+        .stat-card .worse { color: var(--danger); }
+
+        .controls {
+            display: flex;
+            gap: 16px;
+            align-items: center;
+            margin-bottom: 16px;
+        }
+        .controls label { font-size: 13px; color: var(--muted); display: flex; align-items: center; gap: 6px; cursor: pointer; }
+        .controls input[type="checkbox"] { width: 16px; height: 16px; }
+
+        .chart-card {
+            background: var(--card);
+            border: 1px solid var(--border);
+            border-radius: 8px;
+            padding: 16px;
+            margin-bottom: 16px;
+        }
+        .chart-card canvas { width: 100% !important; height: 280px !important; }
+        .chart-card.small canvas { height: 180px !important; }
+
+        .chart-grid {
+            display: grid;
+            grid-template-columns: 1fr 1fr;
+            gap: 16px;
+            margin-bottom: 24px;
+        }
+        @media (max-width: 900px) { .chart-grid { grid-template-columns: 1fr; } }
+    </style>
+</head>
+<body>
+    <h1>PaperColor Battery Comparison</h1>
+    <h2>Compare battery drain between two wake log captures</h2>
+
+    <div class="drop-row">
+        <div class="drop-zone" id="dropA">
+            <div class="label label-a">Log A (Baseline)</div>
+            <p><strong>Drop CSV here</strong> or click to browse</p>
+            <input type="file" id="fileA" accept=".csv,text/csv">
+            <div class="meta" id="metaA"></div>
+        </div>
+        <div class="drop-zone" id="dropB">
+            <div class="label label-b">Log B (Comparison)</div>
+            <p><strong>Drop CSV here</strong> or click to browse</p>
+            <input type="file" id="fileB" accept=".csv,text/csv">
+            <div class="meta" id="metaB"></div>
+        </div>
+    </div>
+
+    <div id="viewer" class="hidden">
+        <div class="summary" id="summary"></div>
+
+        <div class="controls">
+            <label><input type="checkbox" id="sleepOnly" checked> Sleep mode only (exclude normal/charging)</label>
+            <label><input type="checkbox" id="showFailures" checked> Show failure events</label>
+        </div>
+
+        <div class="chart-card">
+            <h3>Battery % over Elapsed Time</h3>
+            <canvas id="chartBattery"></canvas>
+        </div>
+
+        <div class="chart-grid">
+            <div class="chart-card small">
+                <h3>Drain Rate (%/hr, rolling 10-entry window)</h3>
+                <canvas id="chartDrainRate"></canvas>
+            </div>
+            <div class="chart-card small">
+                <h3>Cumulative Failures</h3>
+                <canvas id="chartFailures"></canvas>
+            </div>
+        </div>
+    </div>
+
+    <script>
+    let logA = null, logB = null;
+    let nameA = 'Log A', nameB = 'Log B';
+    let charts = {};
+
+    // --- CSV Parsing ---
+    function parseCSV(text) {
+        const lines = text.trim().split('\n').filter(l => l.trim());
+        return lines.map(line => {
+            const p = line.split(',');
+            return {
+                timestamp: p[0] || '',
+                battery_pct: parseInt(p[1]) || 0,
+                free_psram_kb: parseInt(p[2]) || 0,
+                free_heap_kb: parseInt(p[3]) || 0,
+                wifi_rssi: parseInt(p[4]) || 0,
+                wifi_ms: parseInt(p[5]) || 0,
+                cycle_ms: parseInt(p[6]) || 0,
+                rtc_valid: p[7] === '1',
+                boot_count: parseInt(p[8]) || 0,
+                filter: p[9] || '',
+                asset_id: p[10] || '',
+                photo_date: p[11] || '',
+                result: p[12] || '',
+                wake_type: p[13] || '',
+                last_error_ts: p[14] || '',
+                errors_total: parseInt(p[15]) || 0,
+            };
+        }).filter(r => r.timestamp && r.timestamp !== 'no_clock');
+    }
+
+    function elapsedHours(rows) {
+        if (rows.length === 0) return [];
+        const t0 = new Date(rows[0].timestamp).getTime();
+        return rows.map(r => (new Date(r.timestamp).getTime() - t0) / 3600000);
+    }
+
+    function computeStats(rows) {
+        if (rows.length === 0) return null;
+        const hours = elapsedHours(rows);
+        const totalDuration = hours[hours.length - 1];
+        const startBatt = rows[0].battery_pct;
+
+        // Find the minimum battery point (end of actual drain, before any charging tail)
+        let minBatt = startBatt;
+        let minIdx = 0;
+        for (let i = 0; i < rows.length; i++) {
+            if (rows[i].battery_pct <= minBatt) {
+                minBatt = rows[i].battery_pct;
+                minIdx = i;
+            }
+        }
+
+        const drainDuration = hours[minIdx];
+        const drainRate = drainDuration > 0 ? (startBatt - minBatt) / drainDuration : 0;
+        const failures = rows.slice(0, minIdx + 1).filter(r => r.result !== 'ok').length;
+        const failRate = (minIdx + 1) > 0 ? (failures / (minIdx + 1) * 100) : 0;
+        const first = rows[0].timestamp;
+        const last = rows[rows.length - 1].timestamp;
+        return { totalDuration, drainDuration, startBatt, minBatt, drainRate, failures, failRate, first, last, count: rows.length, drainEntries: minIdx + 1 };
+    }
+
+    // --- File Input ---
+    function setupDrop(zoneId, inputId, metaId, slot) {
+        const zone = document.getElementById(zoneId);
+        const input = document.getElementById(inputId);
+        const meta = document.getElementById(metaId);
+
+        zone.addEventListener('click', () => input.click());
+        zone.addEventListener('dragover', e => { e.preventDefault(); zone.classList.add('dragover'); });
+        zone.addEventListener('dragleave', () => zone.classList.remove('dragover'));
+        zone.addEventListener('drop', e => {
+            e.preventDefault();
+            zone.classList.remove('dragover');
+            if (e.dataTransfer.files.length) loadLog(e.dataTransfer.files[0], slot, zone, meta);
+        });
+        input.addEventListener('change', e => {
+            if (e.target.files.length) loadLog(e.target.files[0], slot, zone, meta);
+        });
+    }
+
+    function loadLog(file, slot, zone, metaEl) {
+        const reader = new FileReader();
+        reader.onload = e => {
+            const rows = parseCSV(e.target.result);
+            if (rows.length === 0) return;
+
+            if (slot === 'A') { logA = rows; nameA = file.name; }
+            else { logB = rows; nameB = file.name; }
+
+            zone.classList.add('loaded');
+            const stats = computeStats(rows);
+            metaEl.textContent = `${file.name} | ${rows.length} entries | ${new Date(stats.first).toLocaleDateString()} - ${new Date(stats.last).toLocaleDateString()}`;
+
+            if (logA && logB) {
+                document.getElementById('viewer').classList.remove('hidden');
+                render();
+            }
+        };
+        reader.readAsText(file);
+    }
+
+    setupDrop('dropA', 'fileA', 'metaA', 'A');
+    setupDrop('dropB', 'fileB', 'metaB', 'B');
+
+    // --- Render ---
+    document.getElementById('showFailures').addEventListener('change', render);
+    document.getElementById('sleepOnly').addEventListener('change', render);
+
+    function getFilteredLogs() {
+        const sleepOnly = document.getElementById('sleepOnly').checked;
+        const a = sleepOnly ? logA.filter(r => r.wake_type === 'sleep') : logA;
+        const b = sleepOnly ? logB.filter(r => r.wake_type === 'sleep') : logB;
+        return { a, b };
+    }
+
+    function render() {
+        if (!logA || !logB) return;
+        renderSummary();
+        renderCharts();
+    }
+
+    function renderSummary() {
+        const { a: filtA, b: filtB } = getFilteredLogs();
+        const a = computeStats(filtA);
+        const b = computeStats(filtB);
+        if (!a || !b) return;
+        const drainDelta = b.drainRate - a.drainRate;
+        const drainBetter = drainDelta < 0;
+        const failDelta = b.failRate - a.failRate;
+        const failBetter = failDelta < 0;
+
+        document.getElementById('summary').innerHTML = `
+            <div class="stat-card">
+                <div class="label">Drain Duration (to min battery)</div>
+                <div class="values">
+                    <span class="val-a">${a.drainDuration.toFixed(1)}h</span>
+                    <span class="val-b">${b.drainDuration.toFixed(1)}h</span>
+                </div>
+            </div>
+            <div class="stat-card">
+                <div class="label">Battery (start / min)</div>
+                <div class="values">
+                    <span class="val-a">${a.startBatt}% / ${a.minBatt}%</span>
+                    <span class="val-b">${b.startBatt}% / ${b.minBatt}%</span>
+                </div>
+            </div>
+            <div class="stat-card">
+                <div class="label">Drain Rate (to min)</div>
+                <div class="values">
+                    <span class="val-a">${a.drainRate.toFixed(2)}%/hr</span>
+                    <span class="val-b">${b.drainRate.toFixed(2)}%/hr</span>
+                    <span class="val-delta ${drainBetter ? 'better' : 'worse'}">${drainDelta > 0 ? '+' : ''}${drainDelta.toFixed(2)}</span>
+                </div>
+            </div>
+            <div class="stat-card">
+                <div class="label">Failure Rate (drain period)</div>
+                <div class="values">
+                    <span class="val-a">${a.failRate.toFixed(1)}%</span>
+                    <span class="val-b">${b.failRate.toFixed(1)}%</span>
+                    <span class="val-delta ${failBetter ? 'better' : 'worse'}">${failDelta > 0 ? '+' : ''}${failDelta.toFixed(1)}%</span>
+                </div>
+            </div>
+            <div class="stat-card">
+                <div class="label">Failures (drain period)</div>
+                <div class="values">
+                    <span class="val-a">${a.failures}</span>
+                    <span class="val-b">${b.failures}</span>
+                </div>
+            </div>
+            <div class="stat-card">
+                <div class="label">Entries (total / drain)</div>
+                <div class="values">
+                    <span class="val-a">${a.count} / ${a.drainEntries}</span>
+                    <span class="val-b">${b.count} / ${b.drainEntries}</span>
+                </div>
+            </div>
+        `;
+    }
+
+    function renderCharts() {
+        Object.values(charts).forEach(c => c.destroy());
+        charts = {};
+
+        const { a: filtA, b: filtB } = getFilteredLogs();
+        const showFail = document.getElementById('showFailures').checked;
+        const isDark = window.matchMedia('(prefers-color-scheme: dark)').matches;
+        const gridColor = isDark ? '#334155' : '#e2e8f0';
+        const textColor = isDark ? '#94a3b8' : '#64748b';
+        const accentA = isDark ? '#60a5fa' : '#2563eb';
+        const accentB = isDark ? '#fbbf24' : '#d97706';
+        const failColorA = isDark ? '#f87171' : '#dc2626';
+        const failColorB = isDark ? '#fb923c' : '#ea580c';
+
+        const hoursA = elapsedHours(filtA);
+        const hoursB = elapsedHours(filtB);
+
+        // Battery chart datasets
+        const battA = filtA.map((r, i) => ({ x: hoursA[i], y: r.battery_pct }));
+        const battB = filtB.map((r, i) => ({ x: hoursB[i], y: r.battery_pct }));
+
+        const datasets = [
+            { label: nameA, data: battA, borderColor: accentA, backgroundColor: accentA + '44', pointRadius: 1.5, showLine: true, tension: 0.3, borderWidth: 2 },
+            { label: nameB, data: battB, borderColor: accentB, backgroundColor: accentB + '44', pointRadius: 1.5, showLine: true, tension: 0.3, borderWidth: 2 },
+        ];
+
+        if (showFail) {
+            const failPtsA = filtA.filter(r => r.result !== 'ok').map(r => {
+                const idx = filtA.indexOf(r);
+                return { x: hoursA[idx], y: r.battery_pct };
+            });
+            const failPtsB = filtB.filter(r => r.result !== 'ok').map(r => {
+                const idx = filtB.indexOf(r);
+                return { x: hoursB[idx], y: r.battery_pct };
+            });
+
+            if (failPtsA.length > 0) {
+                datasets.push({
+                    label: nameA + ' failures',
+                    data: failPtsA,
+                    borderColor: failColorA,
+                    backgroundColor: failColorA + '88',
+                    pointRadius: 4,
+                    pointStyle: 'crossRot',
+                    showLine: false,
+                });
+            }
+            if (failPtsB.length > 0) {
+                datasets.push({
+                    label: nameB + ' failures',
+                    data: failPtsB,
+                    borderColor: failColorB,
+                    backgroundColor: failColorB + '88',
+                    pointRadius: 4,
+                    pointStyle: 'crossRot',
+                    showLine: false,
+                });
+            }
+        }
+
+        charts.battery = new Chart(document.getElementById('chartBattery'), {
+            type: 'scatter',
+            data: { datasets },
+            options: {
+                responsive: true,
+                maintainAspectRatio: false,
+                interaction: { mode: 'nearest', intersect: false },
+                plugins: { legend: { labels: { color: textColor, font: { size: 12 } } } },
+                scales: {
+                    x: { type: 'linear', title: { display: true, text: 'Elapsed Hours', color: textColor }, grid: { color: gridColor }, ticks: { color: textColor } },
+                    y: { title: { display: true, text: 'Battery %', color: textColor }, grid: { color: gridColor }, ticks: { color: textColor }, min: 0, max: 105 }
+                }
+            }
+        });
+
+        // Truncate rows to drain period only (up to min battery, before charging tail)
+        function drainOnly(rows) {
+            if (rows.length === 0) return rows;
+            let minBatt = rows[0].battery_pct;
+            let minIdx = 0;
+            for (let i = 0; i < rows.length; i++) {
+                if (rows[i].battery_pct <= minBatt) {
+                    minBatt = rows[i].battery_pct;
+                    minIdx = i;
+                }
+            }
+            return rows.slice(0, minIdx + 1);
+        }
+
+        const drainA = drainOnly(filtA);
+        const drainB = drainOnly(filtB);
+        const drainHoursA = elapsedHours(drainA);
+        const drainHoursB = elapsedHours(drainB);
+
+        // Drain rate chart (rolling window, drain period only)
+        const windowSize = 10;
+        function drainRateSeries(rows, hours) {
+            const pts = [];
+            for (let i = windowSize; i < rows.length; i++) {
+                const dt = hours[i] - hours[i - windowSize];
+                if (dt <= 0) continue;
+                const dBatt = rows[i - windowSize].battery_pct - rows[i].battery_pct;
+                pts.push({ x: hours[i], y: dBatt / dt });
+            }
+            return pts;
+        }
+
+        charts.drainRate = new Chart(document.getElementById('chartDrainRate'), {
+            type: 'scatter',
+            data: { datasets: [
+                { label: nameA, data: drainRateSeries(drainA, drainHoursA), borderColor: accentA, backgroundColor: accentA + '44', pointRadius: 1, showLine: true, tension: 0.4, borderWidth: 1.5 },
+                { label: nameB, data: drainRateSeries(drainB, drainHoursB), borderColor: accentB, backgroundColor: accentB + '44', pointRadius: 1, showLine: true, tension: 0.4, borderWidth: 1.5 },
+            ]},
+            options: {
+                responsive: true,
+                maintainAspectRatio: false,
+                plugins: { legend: { labels: { color: textColor, font: { size: 11 } } } },
+                scales: {
+                    x: { type: 'linear', title: { display: true, text: 'Elapsed Hours', color: textColor }, grid: { color: gridColor }, ticks: { color: textColor, font: { size: 10 } } },
+                    y: { title: { display: true, text: '%/hr', color: textColor }, grid: { color: gridColor }, ticks: { color: textColor, font: { size: 10 } } }
+                }
+            }
+        });
+
+        // Cumulative failures chart (drain period only)
+        function cumulFailSeries(rows, hours) {
+            const pts = [];
+            let count = 0;
+            for (let i = 0; i < rows.length; i++) {
+                if (rows[i].result !== 'ok') count++;
+                pts.push({ x: hours[i], y: count });
+            }
+            return pts;
+        }
+
+        charts.failures = new Chart(document.getElementById('chartFailures'), {
+            type: 'scatter',
+            data: { datasets: [
+                { label: nameA, data: cumulFailSeries(drainA, drainHoursA), borderColor: accentA, backgroundColor: accentA + '22', pointRadius: 0, showLine: true, stepped: 'before', borderWidth: 2, fill: true },
+                { label: nameB, data: cumulFailSeries(drainB, drainHoursB), borderColor: accentB, backgroundColor: accentB + '22', pointRadius: 0, showLine: true, stepped: 'before', borderWidth: 2, fill: true },
+            ]},
+            options: {
+                responsive: true,
+                maintainAspectRatio: false,
+                plugins: { legend: { labels: { color: textColor, font: { size: 11 } } } },
+                scales: {
+                    x: { type: 'linear', title: { display: true, text: 'Elapsed Hours', color: textColor }, grid: { color: gridColor }, ticks: { color: textColor, font: { size: 10 } } },
+                    y: { title: { display: true, text: 'Failures', color: textColor }, grid: { color: gridColor }, ticks: { color: textColor, font: { size: 10 } }, beginAtZero: true }
+                }
+            }
+        });
+    }
+    </script>
+</body>
+</html>

tools/log-viewer.html

@@ -0,0 +1,432 @@
+<!DOCTYPE html>
+<html lang="en">
+<head>
+    <meta charset="UTF-8">
+    <meta name="viewport" content="width=device-width, initial-scale=1.0">
+    <title>PaperColor Wake Log Viewer</title>
+    <script src="./vendor/chart.umd.min.js"></script>
+    <script src="./vendor/chartjs-adapter-date-fns.bundle.min.js"></script>
+    <style>
+        :root {
+            --bg: #f8fafc;
+            --card: #ffffff;
+            --text: #1e293b;
+            --muted: #64748b;
+            --border: #e2e8f0;
+            --accent: #2563eb;
+            --success: #16a34a;
+            --danger: #dc2626;
+            --warn: #d97706;
+        }
+        @media (prefers-color-scheme: dark) {
+            :root {
+                --bg: #0f172a;
+                --card: #1e293b;
+                --text: #f1f5f9;
+                --muted: #94a3b8;
+                --border: #334155;
+                --accent: #60a5fa;
+                --success: #4ade80;
+                --danger: #f87171;
+                --warn: #fbbf24;
+            }
+        }
+        * { box-sizing: border-box; margin: 0; padding: 0; }
+        body {
+            font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
+            background: var(--bg);
+            color: var(--text);
+            line-height: 1.5;
+            padding: 24px;
+        }
+        h1 { font-size: 22px; margin-bottom: 4px; }
+        h2 { font-size: 16px; color: var(--muted); margin-bottom: 16px; }
+        h3 { font-size: 14px; color: var(--muted); margin-bottom: 8px; text-transform: uppercase; letter-spacing: 0.5px; }
+
+        .drop-zone {
+            border: 2px dashed var(--border);
+            border-radius: 12px;
+            padding: 48px;
+            text-align: center;
+            cursor: pointer;
+            transition: border-color 0.2s, background 0.2s;
+            margin-bottom: 24px;
+        }
+        .drop-zone:hover, .drop-zone.dragover {
+            border-color: var(--accent);
+            background: color-mix(in srgb, var(--accent) 5%, transparent);
+        }
+        .drop-zone input { display: none; }
+        .drop-zone p { color: var(--muted); font-size: 15px; }
+        .drop-zone p strong { color: var(--text); }
+
+        .hidden { display: none !important; }
+
+        .summary {
+            display: grid;
+            grid-template-columns: repeat(auto-fit, minmax(180px, 1fr));
+            gap: 12px;
+            margin-bottom: 24px;
+        }
+        .stat-card {
+            background: var(--card);
+            border: 1px solid var(--border);
+            border-radius: 8px;
+            padding: 14px 16px;
+        }
+        .stat-card .label { font-size: 12px; color: var(--muted); text-transform: uppercase; letter-spacing: 0.5px; }
+        .stat-card .value { font-size: 20px; font-weight: 600; margin-top: 2px; }
+
+        .filters {
+            display: flex;
+            gap: 12px;
+            align-items: center;
+            margin-bottom: 16px;
+            flex-wrap: wrap;
+        }
+        .filters label { font-size: 13px; color: var(--muted); display: flex; align-items: center; gap: 4px; cursor: pointer; }
+        .filters input[type="checkbox"] { width: 16px; height: 16px; }
+
+        .chart-grid {
+            display: grid;
+            grid-template-columns: 1fr 1fr;
+            gap: 16px;
+            margin-bottom: 24px;
+        }
+        @media (max-width: 900px) { .chart-grid { grid-template-columns: 1fr; } }
+        .chart-card {
+            background: var(--card);
+            border: 1px solid var(--border);
+            border-radius: 8px;
+            padding: 16px;
+        }
+        .chart-card canvas { width: 100% !important; height: 200px !important; }
+
+        .table-wrap {
+            background: var(--card);
+            border: 1px solid var(--border);
+            border-radius: 8px;
+            overflow-x: auto;
+            margin-bottom: 24px;
+        }
+        table {
+            width: 100%;
+            border-collapse: collapse;
+            font-size: 12px;
+            white-space: nowrap;
+        }
+        th, td { padding: 6px 10px; text-align: left; border-bottom: 1px solid var(--border); }
+        th {
+            background: var(--bg);
+            position: sticky;
+            top: 0;
+            cursor: pointer;
+            user-select: none;
+            font-size: 11px;
+            text-transform: uppercase;
+            letter-spacing: 0.3px;
+            color: var(--muted);
+        }
+        th:hover { color: var(--text); }
+        th .sort-arrow { margin-left: 4px; font-size: 10px; }
+        .result-ok { color: var(--success); font-weight: 600; }
+        .result-fail { color: var(--danger); font-weight: 600; }
+        .wake-sleep { color: var(--warn); }
+        .wake-normal { color: var(--accent); }
+        .id-cell { max-width: 100px; overflow: hidden; text-overflow: ellipsis; }
+    </style>
+</head>
+<body>
+    <h1>PaperColor Wake Log Viewer</h1>
+    <h2>Drop or select a wake_log.csv file to visualize</h2>
+
+    <div class="drop-zone" id="dropZone">
+        <p><strong>Drop wake_log.csv here</strong> or click to browse</p>
+        <input type="file" id="fileInput" accept=".csv,text/csv">
+    </div>
+
+    <div id="viewer" class="hidden">
+        <div class="summary" id="summary"></div>
+
+        <div class="filters" id="filters">
+            <label><input type="checkbox" id="filterNormal" checked> Normal</label>
+            <label><input type="checkbox" id="filterSleep" checked> Sleep</label>
+            <label><input type="checkbox" id="filterOk" checked> OK</label>
+            <label><input type="checkbox" id="filterFail" checked> Failures</label>
+        </div>
+
+        <div class="chart-grid" id="charts">
+            <div class="chart-card"><h3>Battery %</h3><canvas id="chartBattery"></canvas></div>
+            <div class="chart-card"><h3>WiFi RSSI (dBm)</h3><canvas id="chartRssi"></canvas></div>
+            <div class="chart-card"><h3>Free Memory (KB)</h3><canvas id="chartMemory"></canvas></div>
+            <div class="chart-card"><h3>Cycle Duration (ms)</h3><canvas id="chartCycle"></canvas></div>
+        </div>
+
+        <div class="table-wrap">
+            <table>
+                <thead id="tableHead"></thead>
+                <tbody id="tableBody"></tbody>
+            </table>
+        </div>
+    </div>
+
+    <script>
+    const COLUMNS = [
+        'timestamp','battery_pct','free_psram_kb','free_heap_kb','wifi_rssi',
+        'wifi_ms','cycle_ms','rtc_valid','boot_count','filter',
+        'asset_id','photo_date','result','wake_type','last_error_ts','errors_total'
+    ];
+
+    let allRows = [];
+    let sortCol = 0;
+    let sortAsc = false;
+    let charts = {};
+
+    // --- File input ---
+    const dropZone = document.getElementById('dropZone');
+    const fileInput = document.getElementById('fileInput');
+
+    dropZone.addEventListener('click', () => fileInput.click());
+    dropZone.addEventListener('dragover', e => { e.preventDefault(); dropZone.classList.add('dragover'); });
+    dropZone.addEventListener('dragleave', () => dropZone.classList.remove('dragover'));
+    dropZone.addEventListener('drop', e => {
+        e.preventDefault();
+        dropZone.classList.remove('dragover');
+        if (e.dataTransfer.files.length) loadFile(e.dataTransfer.files[0]);
+    });
+    fileInput.addEventListener('change', e => { if (e.target.files.length) loadFile(e.target.files[0]); });
+
+    function loadFile(file) {
+        const reader = new FileReader();
+        reader.onload = e => {
+            const text = e.target.result.trim();
+            if (!text) return;
+            parseCSV(text);
+            document.getElementById('viewer').classList.remove('hidden');
+            dropZone.classList.add('hidden');
+            render();
+        };
+        reader.readAsText(file);
+    }
+
+    function parseCSV(text) {
+        const lines = text.split('\n').filter(l => l.trim());
+        allRows = lines.map(line => {
+            const parts = line.split(',');
+            return {
+                timestamp: parts[0] || '',
+                battery_pct: parseInt(parts[1]) || 0,
+                free_psram_kb: parseInt(parts[2]) || 0,
+                free_heap_kb: parseInt(parts[3]) || 0,
+                wifi_rssi: parseInt(parts[4]) || 0,
+                wifi_ms: parseInt(parts[5]) || 0,
+                cycle_ms: parseInt(parts[6]) || 0,
+                rtc_valid: parts[7] === '1',
+                boot_count: parseInt(parts[8]) || 0,
+                filter: parts[9] || '',
+                asset_id: parts[10] || '',
+                photo_date: parts[11] || '',
+                result: parts[12] || '',
+                wake_type: parts[13] || '',
+                last_error_ts: parts[14] || '',
+                errors_total: parseInt(parts[15]) || 0,
+            };
+        });
+    }
+
+    function getFiltered() {
+        const showNormal = document.getElementById('filterNormal').checked;
+        const showSleep = document.getElementById('filterSleep').checked;
+        const showOk = document.getElementById('filterOk').checked;
+        const showFail = document.getElementById('filterFail').checked;
+        return allRows.filter(r => {
+            if (r.wake_type === 'normal' && !showNormal) return false;
+            if (r.wake_type === 'sleep' && !showSleep) return false;
+            if (r.result === 'ok' && !showOk) return false;
+            if (r.result !== 'ok' && !showFail) return false;
+            return true;
+        });
+    }
+
+    // --- Filters ---
+    document.querySelectorAll('.filters input').forEach(el => {
+        el.addEventListener('change', render);
+    });
+
+    // --- Render ---
+    function render() {
+        const rows = getFiltered();
+        renderSummary(rows);
+        renderCharts(rows);
+        renderTable(rows);
+    }
+
+    function renderSummary(rows) {
+        if (rows.length === 0) {
+            document.getElementById('summary').innerHTML = '<div class="stat-card"><div class="value">No data</div></div>';
+            return;
+        }
+        const first = rows[0].timestamp;
+        const last = rows[rows.length - 1].timestamp;
+        const okCount = rows.filter(r => r.result === 'ok').length;
+        const successRate = ((okCount / rows.length) * 100).toFixed(1);
+        const avgBatt = (rows.reduce((s, r) => s + r.battery_pct, 0) / rows.length).toFixed(0);
+        const rssiVals = rows.map(r => r.wifi_rssi).filter(v => v !== 0);
+        const minRssi = rssiVals.length ? Math.min(...rssiVals) : 'N/A';
+        const maxRssi = rssiVals.length ? Math.max(...rssiVals) : 'N/A';
+        const bootMin = Math.min(...rows.map(r => r.boot_count));
+        const bootMax = Math.max(...rows.map(r => r.boot_count));
+        const totalErrors = rows.length > 0 ? rows[rows.length - 1].errors_total : 0;
+
+        const formatTs = ts => {
+            if (!ts || ts === 'no_clock') return ts;
+            try { return new Date(ts).toLocaleString(); } catch { return ts; }
+        };
+
+        document.getElementById('summary').innerHTML = `
+            <div class="stat-card"><div class="label">Entries</div><div class="value">${rows.length}</div></div>
+            <div class="stat-card"><div class="label">Success Rate</div><div class="value">${successRate}%</div></div>
+            <div class="stat-card"><div class="label">Avg Battery</div><div class="value">${avgBatt}%</div></div>
+            <div class="stat-card"><div class="label">RSSI Range</div><div class="value">${maxRssi} / ${minRssi} dBm</div></div>
+            <div class="stat-card"><div class="label">Boot Count</div><div class="value">${bootMin}–${bootMax}</div></div>
+            <div class="stat-card"><div class="label">Total Errors</div><div class="value">${totalErrors}</div></div>
+            <div class="stat-card"><div class="label">First Entry</div><div class="value" style="font-size:13px">${formatTs(first)}</div></div>
+            <div class="stat-card"><div class="label">Last Entry</div><div class="value" style="font-size:13px">${formatTs(last)}</div></div>
+        `;
+    }
+
+    function makeDatasets(rows, key, label, color) {
+        const normalPts = [];
+        const sleepPts = [];
+        const failPts = [];
+        rows.forEach(r => {
+            const pt = { x: new Date(r.timestamp), y: r[key] };
+            if (r.result !== 'ok') failPts.push(pt);
+            else if (r.wake_type === 'sleep') sleepPts.push(pt);
+            else normalPts.push(pt);
+        });
+        return [
+            { label: label + ' (normal)', data: normalPts, borderColor: '#2563eb', backgroundColor: '#2563eb88', pointRadius: 3, showLine: true, tension: 0.3 },
+            { label: label + ' (sleep)', data: sleepPts, borderColor: '#d97706', backgroundColor: '#d9770688', pointRadius: 3, showLine: true, tension: 0.3 },
+            { label: label + ' (fail)', data: failPts, borderColor: '#dc2626', backgroundColor: '#dc262688', pointRadius: 5, pointStyle: 'crossRot', showLine: false },
+        ];
+    }
+
+    function chartOpts(yLabel) {
+        const isDark = window.matchMedia('(prefers-color-scheme: dark)').matches;
+        const gridColor = isDark ? '#334155' : '#e2e8f0';
+        const textColor = isDark ? '#94a3b8' : '#64748b';
+        return {
+            responsive: true,
+            maintainAspectRatio: false,
+            interaction: { mode: 'nearest', intersect: false },
+            plugins: { legend: { display: true, labels: { boxWidth: 10, font: { size: 11 }, color: textColor } } },
+            scales: {
+                x: { type: 'time', time: { tooltipFormat: 'MMM d, HH:mm' }, grid: { color: gridColor }, ticks: { color: textColor, font: { size: 10 } } },
+                y: { title: { display: true, text: yLabel, color: textColor, font: { size: 11 } }, grid: { color: gridColor }, ticks: { color: textColor, font: { size: 10 } } }
+            }
+        };
+    }
+
+    function renderCharts(rows) {
+        Object.values(charts).forEach(c => c.destroy());
+        charts = {};
+
+        const validRows = rows.filter(r => r.timestamp && r.timestamp !== 'no_clock');
+
+        charts.battery = new Chart(document.getElementById('chartBattery'), {
+            type: 'scatter',
+            data: { datasets: makeDatasets(validRows, 'battery_pct', 'Battery', '#2563eb') },
+            options: chartOpts('Battery %')
+        });
+
+        charts.rssi = new Chart(document.getElementById('chartRssi'), {
+            type: 'scatter',
+            data: { datasets: makeDatasets(validRows, 'wifi_rssi', 'RSSI', '#2563eb') },
+            options: chartOpts('dBm')
+        });
+
+        const isDark = window.matchMedia('(prefers-color-scheme: dark)').matches;
+        const gridColor = isDark ? '#334155' : '#e2e8f0';
+        const textColor = isDark ? '#94a3b8' : '#64748b';
+        const memNormal = [], memSleep = [];
+        const heapNormal = [], heapSleep = [];
+        validRows.forEach(r => {
+            const pt1 = { x: new Date(r.timestamp), y: r.free_psram_kb };
+            const pt2 = { x: new Date(r.timestamp), y: r.free_heap_kb };
+            if (r.wake_type === 'sleep') { memSleep.push(pt1); heapSleep.push(pt2); }
+            else { memNormal.push(pt1); heapNormal.push(pt2); }
+        });
+        charts.memory = new Chart(document.getElementById('chartMemory'), {
+            type: 'scatter',
+            data: { datasets: [
+                { label: 'PSRAM (normal)', data: memNormal, borderColor: '#2563eb', backgroundColor: '#2563eb88', pointRadius: 3, showLine: true, tension: 0.3 },
+                { label: 'PSRAM (sleep)', data: memSleep, borderColor: '#d97706', backgroundColor: '#d9770688', pointRadius: 3, showLine: true, tension: 0.3 },
+                { label: 'Heap (normal)', data: heapNormal, borderColor: '#16a34a', backgroundColor: '#16a34a88', pointRadius: 3, showLine: true, tension: 0.3 },
+                { label: 'Heap (sleep)', data: heapSleep, borderColor: '#9333ea', backgroundColor: '#9333ea88', pointRadius: 3, showLine: true, tension: 0.3 },
+            ]},
+            options: chartOpts('KB')
+        });
+
+        charts.cycle = new Chart(document.getElementById('chartCycle'), {
+            type: 'scatter',
+            data: { datasets: makeDatasets(validRows, 'cycle_ms', 'Cycle', '#2563eb') },
+            options: chartOpts('ms')
+        });
+    }
+
+    function renderTable(rows) {
+        const thead = document.getElementById('tableHead');
+        const tbody = document.getElementById('tableBody');
+
+        thead.innerHTML = '<tr>' + COLUMNS.map((col, i) =>
+            `<th onclick="sortTable(${i})">${col.replace(/_/g, ' ')}<span class="sort-arrow">${sortCol === i ? (sortAsc ? '▲' : '▼') : ''}</span></th>`
+        ).join('') + '</tr>';
+
+        const sorted = [...rows].sort((a, b) => {
+            const key = COLUMNS[sortCol];
+            let av = a[key], bv = b[key];
+            if (typeof av === 'number') return sortAsc ? av - bv : bv - av;
+            av = String(av); bv = String(bv);
+            return sortAsc ? av.localeCompare(bv) : bv.localeCompare(av);
+        });
+
+        tbody.innerHTML = sorted.map(r => {
+            const resultClass = r.result === 'ok' ? 'result-ok' : 'result-fail';
+            const wakeClass = r.wake_type === 'sleep' ? 'wake-sleep' : 'wake-normal';
+            const shortTs = r.timestamp && r.timestamp !== 'no_clock'
+                ? new Date(r.timestamp).toLocaleString(undefined, { month:'short', day:'numeric', hour:'2-digit', minute:'2-digit' })
+                : r.timestamp;
+            const shortId = r.asset_id ? r.asset_id.substring(0, 8) + '...' : '';
+            const shortPhotoDate = r.photo_date && r.photo_date !== ''
+                ? r.photo_date.substring(0, 10)
+                : '';
+            return `<tr>
+                <td>${shortTs}</td>
+                <td>${r.battery_pct}%</td>
+                <td>${r.free_psram_kb}</td>
+                <td>${r.free_heap_kb}</td>
+                <td>${r.wifi_rssi}</td>
+                <td>${r.wifi_ms}</td>
+                <td>${r.cycle_ms}</td>
+                <td>${r.rtc_valid ? '✓' : '✗'}</td>
+                <td>${r.boot_count}</td>
+                <td>${r.filter}</td>
+                <td class="id-cell" title="${r.asset_id}">${shortId}</td>
+                <td>${shortPhotoDate}</td>
+                <td class="${resultClass}">${r.result}</td>
+                <td class="${wakeClass}">${r.wake_type}</td>
+                <td>${r.last_error_ts}</td>
+                <td>${r.errors_total}</td>
+            </tr>`;
+        }).join('');
+    }
+
+    window.sortTable = function(col) {
+        if (sortCol === col) sortAsc = !sortAsc;
+        else { sortCol = col; sortAsc = true; }
+        render();
+    };
+    </script>
+</body>
+</html>