Added test suite that validates all replay viewer functionality:
- Canvas renders grid, bots, energy cells correctly
- Playback controls (play/pause, step, speed) work
- Transcript panel generates turn-by-turn events
- Win probability sparkline renders with data
Mobile testing via ADB confirmed all tests pass on Pixel 6:
- Loads real match m_tprjf4ij (712 turns, 4 players)
- Canvas shows walls, bots, cores, energy nodes
- All controls responsive on touch interface
- Layout not broken, text readable, no horizontal overflow
Acceptance criteria met - replay viewer is fully functional
with real match data (real-replay.json in public/data/).
