feat: badge DOM manipulation with MutationObservers and dark mode detection

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

content/main.js

@@ -0,0 +1,23 @@
+(function () {
+  "use strict";
+
+  async function init() {
+    const settings = await window.RedditTweaks.loadSettings();
+    if (!settings.enabled) return;
+
+    window.RedditTweaks.badgeTweak.apply(settings);
+
+    browser.storage.onChanged.addListener(function (changes) {
+      if (changes.enabled) {
+        location.reload();
+        return;
+      }
+
+      window.RedditTweaks.loadSettings().then(function (updated) {
+        window.RedditTweaks.badgeTweak.updateColors(updated);
+      });
+    });
+  }
+
+  init();
+})();