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>

lib/settings.js

@@ -4,13 +4,13 @@
   const DEFAULTS = {
     enabled: true,
     darkMode: "auto",
-    "light.subredditBgColor": "transparent",
+    "light.subredditBgColor": "#fde8e0",
     "light.subredditBorderColor": "#c84a20",
     "light.subredditTextColor": "#c84a20",
     "light.commentsBgColor": "#e0e0e0",
     "light.commentsBorderColor": "#4a4a4a",
     "light.commentsTextColor": "#4a4a4a",
-    "dark.subredditBgColor": "transparent",
+    "dark.subredditBgColor": "#3d2518",
     "dark.subredditBorderColor": "#ff6b3d",
     "dark.subredditTextColor": "#ff6b3d",
     "dark.commentsBgColor": "#3a3a3a",