Verified that the mobile bottom tab bar specified in §16.4 is implemented
in web/index.html as inline styles, not in external CSS files.
The implementation matches specification:
- Four bottom tabs: Home, Watch, Compete, Board
- Persistent bottom tab bar on mobile (<640px)
- Proper z-index layering and responsive behavior
Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>
