- Add new "Colored" playfield type that generates textures from JSON-defined color schemes
- Create colored-playfields.json with 10 curated color themes (Midnight Aurora, Sunset Horizon, etc.)
- Add dropdown selector in OpponentSelectScene to choose between color schemes
- Generate colored playfield textures dynamically using canvas gradients at game start
- Display theme preview in playfield selection UI with CSS gradient rendering
- Integrate colored playfield loading and default application alongside existing playfields