efa612380c
- Create lightsync/frontend/timeline/timeline.js with TimelineCanvas class - Per-device horizontal tracks with track headers and time axis - HiDPI canvas rendering with devicePixelRatio handling - Waveform peaks background layer, beat marks overlay, cue block rendering - Playback cursor synced to audio.currentTime via requestAnimationFrame - Auto-scroll when cursor approaches right edge - Mouse wheel scrolling on timeline canvas - loadTracks(), loadWaveform(), loadBeats() data loading methods - Empty state messages when no devices or audio loaded - Add timeline CSS to style.css (toolbar, canvas, inspector strip, snap button) - Wire timeline into app.js: import, initTimeline(), zoom/beat-offset/snap controls - Remove old animation-grid click listener (element no longer exists in main-area) - Populate animation palette dynamically in sidebar with 7 animation types