Changed from single JSON file to ZIP archive format to avoid string
length limits when serializing large audio buffers.
New ZIP structure:
- project.json (metadata, track info, effects, automation)
- track_0.wav, track_1.wav, etc. (audio files in WAV format)
Benefits:
- No more RangeError: Invalid string length
- Smaller file sizes (WAV compression vs base64 JSON)
- Human-readable audio files in standard format
- Can extract and inspect individual tracks
- Easier to edit/debug project metadata
Added jszip dependency for ZIP file handling.
Changed file picker to accept .zip files.
🤖 Generated with [Claude Code](https://claude.com/claude-code)
Co-Authored-By: Claude <noreply@anthropic.com>