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.html

@@ -28,7 +28,7 @@
       <h2>Light Mode Colors</h2>
       <fieldset>
         <legend>Subreddit Badge</legend>
-        <label>Background <input type="text" id="light.subredditBgColor"></label>
+        <label>Background <input type="color" id="light.subredditBgColor"></label>
         <label>Border <input type="color" id="light.subredditBorderColor"></label>
         <label>Text <input type="color" id="light.subredditTextColor"></label>
       </fieldset>
@@ -45,7 +45,7 @@
       <h2>Dark Mode Colors</h2>
       <fieldset>
         <legend>Subreddit Badge</legend>
-        <label>Background <input type="text" id="dark.subredditBgColor"></label>
+        <label>Background <input type="color" id="dark.subredditBgColor"></label>
         <label>Border <input type="color" id="dark.subredditBorderColor"></label>
         <label>Text <input type="color" id="dark.subredditTextColor"></label>
       </fieldset>