- Fix nav/home breakpoints from 768px → 639px to match design system
- Add leaderboard mobile card view with tap-to-expand stats and full-stats link
- Add canvas wrapper aspect-ratio:1 on phone (fills full width, square viewport)
- Add commentary text scroll on mobile, win-prob header stacking
- Replay viewer: mobile controls, pinch-to-zoom, tap-to-play, swipe scrub,
floating view-mode toggle, debug telemetry slide-up sheet (already in place)
- Sandbox: desktop-required message with link already implemented
Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>
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