Redesign settings UI and log entries, add wb3 logo

- Settings: tab per star with mini-toggle + template count badge
- Templates: full-width textarea per template (not cramped columns)
- Filter mode: pill-cards instead of raw radio buttons
- Save button aligned right with border-top separator
- Log: card-based entries (rating pill, meta row, review/reply blocks)
- wb3.png logo, 160px on login, 40px in topbar with ring shadow
- Fix CSS variable names (--c-* → --line/--card/--text/--muted)

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

templates/admin.html

@@ -11,7 +11,7 @@
 <nav class="topbar">
     <div class="topbar__inner">
         <a href="{{ url_for('index') }}" class="topbar__brand">
-            <img src="{{ url_for('static', filename='wb2.png') }}" class="topbar__logo-img" alt="WB">
+            <img src="{{ url_for('static', filename='wb3.png') }}" class="topbar__logo-img" alt="WB">
             <span class="topbar__name">Feedback</span>
         </a>
         <div class="topbar__nav">