fix: subreddit badge fill, tagline 'to' cleanup, and comments li spacing

- Default subreddit badge background from transparent to opaque fill
  (light: #fde8e0, dark: #3d2518) so page highlights don't bleed through
- Remove lingering "to" text node from tagline when subreddit is hidden
- Hide the <li> wrapping the comments link (not just the <a>) to
  eliminate leftover whitespace in the flat-list
- Simplify popup: subreddit bg fields are now color pickers (no longer
  need transparent text-input workaround)

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

popup/popup.js

@@ -2,11 +2,13 @@
   "use strict";
 
   const COLOR_KEYS = [
+    "light.subredditBgColor",
     "light.subredditBorderColor",
     "light.subredditTextColor",
     "light.commentsBgColor",
     "light.commentsBorderColor",
     "light.commentsTextColor",
+    "dark.subredditBgColor",
     "dark.subredditBorderColor",
     "dark.subredditTextColor",
     "dark.commentsBgColor",
@@ -14,13 +16,8 @@
     "dark.commentsTextColor",
   ];
 
-  const BG_KEYS = [
-    "light.subredditBgColor",
-    "dark.subredditBgColor",
-  ];
-
   function colorToHex(val) {
-    if (!val || val === "transparent") return "#ffffff";
+    if (!val) return "#ffffff";
     return val;
   }
 
@@ -33,14 +30,6 @@
       if (el) el.value = colorToHex(settings[key]);
     });
 
-    BG_KEYS.forEach(function (key) {
-      const el = document.getElementById(key);
-      if (el) {
-        el.value = settings[key] === "transparent" ? "" : settings[key];
-        el.placeholder = "transparent";
-      }
-    });
-
     renderSubredditOverrides(settings.subredditColors || {});
   }
 
@@ -127,13 +116,6 @@
       if (el) settings[key] = el.value;
     });
 
-    BG_KEYS.forEach(function (key) {
-      const el = document.getElementById(key);
-      if (el) {
-        settings[key] = el.value.trim() || "transparent";
-      }
-    });
-
     try {
       await window.RedditTweaks.saveSettings(settings);
     } catch (err) {
@@ -153,11 +135,6 @@
       if (el) el.addEventListener("input", saveFromControls);
     });
 
-    BG_KEYS.forEach(function (key) {
-      const el = document.getElementById(key);
-      if (el) el.addEventListener("input", saveFromControls);
-    });
-
     document.getElementById("addSubreddit").addEventListener("click", function () {
       addSubredditEntry("", {});
     });