docs(timeline-editor): Add comprehensive feature roadmap

Created detailed roadmap for timeline editor future development.

Phase 1: Core Editing Features (HIGH PRIORITY)
- Snap-to-beat: Musical timing with BPM-based grid (4-6h)
- Create new effects: Modal dialog for adding effects (6-8h)
- Overlap detection: Visual warnings for conflicts (8-10h)
Total: 22-28 hours

Phase 2: Productivity Enhancements (MEDIUM PRIORITY)
- Undo/redo system with command pattern (10-12h)
- Multi-select & batch operations (12-15h)
- Copy/paste & duplication (6-8h)
- Keyboard shortcuts & navigation (4-6h)
Total: 38-51 hours

Phase 3: Advanced Features (LOW PRIORITY)
- Timeline playback indicator (4-6h)
- Templates & presets (8-10h)
- Search & filter (6-8h)
- Timeline comparison view (15-20h)
- Export formats (JSON, CSV, MD) (6-8h)
- Auto-save & local storage (4-6h)
Total: 51-74 hours

Implementation Details:
- Technical approach for each feature
- UI mockups and code snippets
- Effort estimates and dependencies
- Success metrics and design principles

Priority recommendation:
1. Snap-to-beat (makes musical timing easy)
2. Create effects (essential for productivity)
3. Overlap detection (prevents rendering bugs)

Total effort for full feature set: ~110-150 hours

The roadmap provides clear guidance for incremental development
while keeping the tool simple and self-contained.

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