root a078d296e3 feat: cinematic camera playback for 3D demo ...

- Add cinematicCamera.ts with 9 camera modes
- Smooth camera transitions with lerp
- Camera follows item during movement
- Category-aware routing views (B/C/D)
- Viewport adaptation (desktop/laptop/mobile)
- Motion trail for movement feedback
- Auto camera toggle button
- 20 unit tests for camera logic

2026-07-09 15:53:50 +02:00

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