- Add AssetLoader with procedurally generated sprites (rock, paper, scissors,
avatars, VS badge, particles, ring glow)
- Redesign BootScene with title glow, rotating avatars, ambient particles
- Redesign LobbyScene with choice icons and improved layout
- Redesign ArenaScene with player avatars, choice icons, visual feedback
- Redesign ResultScene with large choice icons, VS badge, impact particles
- Fix play page layout: remove debug magenta background
Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>