- Add fallback favicon using Google's favicon service (s2/favicons API)
- If both tab.favIconUrl and Google service fail, gracefully hide broken image
- Enhance navigation message styling for better visibility:
- Use accent colors (bg-accent/50 with border-accent) instead of muted secondary
- Increase padding (px-3 py-2) and add vertical margin (my-2)
- Add shadow-sm for subtle depth
- Make title font-medium for better contrast
- Use border-2 instead of border for more prominence
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