feat(remotion): upgrade cinematic TitleCard + add new scene components
- CinematicRenderer.tsx / cinematic/types.ts: TitleCard now supports
ghosted video background, word-by-word stagger reveal with blur->sharp
transition, proper newline handling, and growing accent lines. Title
scenes accept backgroundSrc/backgroundTrimBeforeSeconds/
backgroundTrimAfterSeconds plus a plate|overlay variant.
- Add CollageBurst, LyricOverlay, ScreenshotScene components.
- Explainer, Root, components/index.ts wiring updates.
- SCENE_TYPES.md reflects the new components.
- seedance-2-0 skill + seedance_video.py: small fixes.
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