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.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("", {});