feat: Phase B — CodeMorphScene + DynamicListScene components

- CodeMorphScene: glassmorphism code window with typing animation,
  line-by-line reveal, blinking cursor, optional line highlighting
  synced to word timestamps, macOS-style title bar with traffic lights
- DynamicListScene: spring-bounced item entrance with staggered timing,
  focus dimming (active item highlighted, others dim to 0.35 opacity),
  timestamp-synced item activation via getActiveSegmentAtFrame(),
  configurable icon/bullet per item
- Both components: responsive portrait/landscape layouts, narration
  overlay, watermark, edge case handling
- SceneRouter updated to route code → CodeMorphScene, list → DynamicListScene
- Zero new dependencies — pure Remotion + React

Co-authored-by: videopipe <videopipe@miriad.systems>

Author: Miriad