Replace CSS keyframe-based dice animation with react-spring for smoother
physics-based animation:
- Use spring physics instead of baked quadratic ease-out keyframes
- Track spin count and target face for reliable face landing
- Ensure dice always shows 2-6 (never 1), never consecutive same number
- Face number is deterministic based on seed
- Add dark/light mode theming with distinct color schemes:
- Light: deep indigo (#4f46e5) with white dots
- Dark: light indigo (#818cf8) with dark indigo dots
🤖 Generated with [Claude Code](https://claude.com/claude-code)
Co-Authored-By: Claude <noreply@anthropic.com>
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