feat: add color presets + fix badge hover effect

- Add global color presets: save/apply/delete sets of {bg, border, text}
  colors as reusable presets, shown as mini badges in their own colors.
- Popover: preset badges under preview with + to save, click to apply,
  × on hover to delete.
- Popup: dedicated Color Presets section with same functionality,
  applying to light subreddit badge colors.
- Storage: colorPresets array added to settings defaults.
- Fix badge hover: change brightness(0.9) to brightness(1.1) so hover
  brightens (activates) instead of dimming.

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

popup/popup.css

@@ -210,6 +210,80 @@ fieldset input[type="text"] {
   cursor: pointer;
 }
 
+/* --- Preset badges --- */
+.rt-preset-bar {
+  display: flex;
+  align-items: center;
+  gap: 6px;
+  flex-wrap: wrap;
+  margin-top: 4px;
+}
+
+.rt-preset-list {
+  display: flex;
+  gap: 4px;
+  flex-wrap: wrap;
+}
+
+.rt-preset-badge {
+  display: inline-block;
+  position: relative;
+  border: 1px solid;
+  border-radius: 3px;
+  padding: 2px 6px;
+  font-size: 10px;
+  font-weight: bold;
+  cursor: pointer;
+  line-height: 1.4;
+  user-select: none;
+}
+
+.rt-preset-badge:hover {
+  filter: brightness(1.1);
+}
+
+.rt-preset-delete {
+  display: none;
+  position: absolute;
+  top: -6px;
+  right: -6px;
+  width: 14px;
+  height: 14px;
+  background: #d9534f;
+  color: white;
+  border-radius: 50%;
+  font-size: 10px;
+  line-height: 14px;
+  text-align: center;
+  cursor: pointer;
+}
+
+.rt-preset-badge:hover .rt-preset-delete {
+  display: block;
+}
+
+.rt-preset-add {
+  width: 22px;
+  height: 22px;
+  border: 1px dashed #ccc;
+  border-radius: 3px;
+  background: none;
+  color: #999;
+  font-size: 14px;
+  cursor: pointer;
+  display: flex;
+  align-items: center;
+  justify-content: center;
+  flex-shrink: 0;
+  padding: 0;
+}
+
+.rt-preset-add:hover {
+  border-color: #999;
+  color: #666;
+  background: #f5f5f5;
+}
+
 /* --- Color Picker Widget --- */
 .rt-color-picker {
   margin: 8px 0;

popup/popup.html

@@ -58,6 +58,15 @@
       <button id="resetDark" class="btn-secondary">Reset Dark Defaults</button>
     </div>
 
+    <div class="section">
+      <h2>Color Presets</h2>
+      <p class="section-hint">Saved color sets. Click to apply to light subreddit badge.</p>
+      <div class="rt-preset-bar">
+        <div id="presetList" class="rt-preset-list"></div>
+        <button id="addPreset" class="rt-preset-add" type="button" title="Save light subreddit colors as preset">+</button>
+      </div>
+    </div>
+
     <div class="section">
       <h2>Per-Subreddit Overrides</h2>
       <p class="section-hint">Set custom subreddit badge colors per mode.</p>

popup/popup.js

@@ -220,6 +220,63 @@
     return overrides;
   }
 
+  function renderPopupPresets(presets) {
+    var list = document.getElementById("presetList");
+    list.innerHTML = "";
+    for (var i = 0; i < presets.length; i++) {
+      (function (index) {
+        var p = presets[index];
+        var badge = document.createElement("span");
+        badge.className = "rt-preset-badge";
+        badge.style.background = p.bg;
+        badge.style.borderColor = p.border;
+        badge.style.color = p.text;
+        badge.textContent = "Aa";
+        badge.title = "Click to apply to light subreddit colors";
+        badge.addEventListener("click", function () {
+          setColorValue(document.getElementById("light.subredditBgColor"), p.bg);
+          setColorValue(document.getElementById("light.subredditBorderColor"), p.border);
+          setColorValue(document.getElementById("light.subredditTextColor"), p.text);
+          closePicker();
+          saveFromControls();
+        });
+
+        var del = document.createElement("span");
+        del.className = "rt-preset-delete";
+        del.textContent = "\u00d7";
+        del.addEventListener("click", function (e) {
+          e.stopPropagation();
+          deletePopupPreset(index);
+        });
+        badge.appendChild(del);
+        list.appendChild(badge);
+      })(i);
+    }
+  }
+
+  async function addPopupPreset() {
+    var preset = {
+      bg: getColorValue(document.getElementById("light.subredditBgColor")),
+      border: getColorValue(document.getElementById("light.subredditBorderColor")),
+      text: getColorValue(document.getElementById("light.subredditTextColor")),
+    };
+    var settings = await window.RedditTweaks.loadSettings();
+    var presets = settings.colorPresets || [];
+    presets.push(preset);
+    settings.colorPresets = presets;
+    await window.RedditTweaks.saveSettings(settings);
+    renderPopupPresets(presets);
+  }
+
+  async function deletePopupPreset(index) {
+    var settings = await window.RedditTweaks.loadSettings();
+    var presets = settings.colorPresets || [];
+    presets.splice(index, 1);
+    settings.colorPresets = presets;
+    await window.RedditTweaks.saveSettings(settings);
+    renderPopupPresets(presets);
+  }
+
   async function saveFromControls() {
     var settings = {
       enabled: document.getElementById("enabled").checked,
@@ -255,6 +312,9 @@
       }
     });
 
+    renderPopupPresets(settings.colorPresets || []);
+    document.getElementById("addPreset").addEventListener("click", addPopupPreset);
+
     document.getElementById("addSubreddit").addEventListener("click", function () {
       closePicker();
       addSubredditEntry("", {});