final feature set

tasks/merged-waveform/08-realtime-waveform-rendering.md

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+# 08. Implement Real-Time Waveform Rendering During Playback
+
+meta:
+  id: merged-waveform-08
+  feature: merged-waveform
+  priority: P2
+  depends_on: [merged-waveform-07]
+  tags: [audio, realtime, rendering]
+
+objective:
+- Update waveform in real-time during audio playback
+- Highlight waveform based on current playback position
+- Sync waveform with audio backend position updates
+
+deliverables:
+- Real-time waveform update logic
+- Playback position highlighting
+- Integration with audio backend position tracking
+
+steps:
+1. Subscribe to audio backend position updates
+2. Update waveform data points based on playback position
+3. Implement playback position highlighting
+4. Add animation for progress indicator
+5. Test synchronization with audio playback
+
+tests:
+- Integration: Test waveform sync with audio playback
+- Performance: Measure real-time update overhead
+- Visual: Verify progress highlighting matches audio position
+
+acceptance_criteria:
+- Waveform updates in real-time during playback
+- Playback position is accurately highlighted
+- No lag or desynchronization with audio
+
+validation:
+- Play audio and watch waveform update
+- Verify progress bar matches audio position
+- Test with different playback speeds
+
+notes:
+- Use existing audio position polling in `useAudio.ts`
+- Update waveform every ~100ms for smooth visuals
+- Consider reducing waveform resolution during playback for performance
+- Ensure highlighting doesn't flicker