docs: Add Task #57 - Interactive Timeline Editor (low priority)

Added new low-priority task for creating a web-based interactive editor
for demo.seq files. This would evolve the existing Gantt chart HTML output
into a full interactive editor.

Features:
- Load/save demo.seq files
- Visual Gantt-style timeline
- Drag & drop sequences and effects
- Edit timing and properties
- Overlap detection
- Zoom/pan navigation

Technical scope:
- Pure HTML/JavaScript tool
- No backend or code integration
- No preview rendering
- Standalone editor for timeline files

Priority: Very Low (quality of life improvement)
Effort: 1-2 weeks for basic functionality

This addresses the need for faster iteration on demo timing without
recompiling, and better visualization of sequence overlaps.

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