fix(timeline-editor): Fix parser to handle actual demo.seq format

Fixed critical parsing bugs that prevented loading real demo.seq files.

Issues fixed:
1. Beat notation support: Parse '0b', '4b' as beats and convert to seconds
   - Added BPM parsing from '# BPM 120' comments
   - Helper function: parseTime() converts beats to seconds using BPM

2. Priority modifiers: Handle '+', '=', '-' modifiers correctly
   - '+' increments priority
   - '=' keeps same priority
   - '-' decrements priority (for background effects)
   - Store both absolute priority and modifier for round-trip

3. Inline comments: Strip comments from end of lines with '#'
   - Effect lines like 'EFFECT + FlashEffect 0.0 1.0  # comment' now parse

4. Sequence names: Parse optional sequence names in quotes
   - Format: SEQUENCE <time> <priority> "name" [end]

5. Updated serializer: Output correct format with modifiers
   - Generate 'EFFECT + ClassName ...' instead of 'EFFECT ClassName ... priority'
   - Preserve BPM comment in output
   - Preserve sequence names

Parser now correctly handles:
- SEQUENCE 0b 0 → Start at beat 0, priority 0
- SEQUENCE 4b 0 → Start at beat 4 (2 seconds @ 120 BPM)
- EFFECT - FlashCubeEffect .2 3 → Background effect (priority -1)
- EFFECT + FlashEffect 0.0 1. → Normal effect (priority 0)
- EFFECT = GaussianBlur 0 8 → Same priority as previous

Testing: Load assets/demo.seq should now work correctly.

0 files changed, 0 insertions, 0 deletions