- Implement industry-standard video editing shortcuts (Space, J/K/L, arrows)
- Add playback controls: Space (play/pause), J/K/L (rewind/pause/forward)
- Add navigation: arrow keys (frame stepping), Shift+arrows (5s jumps), Home/End
- Add editing shortcuts: S (split at playhead), N (toggle snapping)
- Add selection shortcuts: Ctrl/Cmd+A (select all), Ctrl/Cmd+D (duplicate)
- Add keyboard shortcuts help dialog with categorized shortcuts display
- Integrate help button in editor header for discoverability
- Add TypeScript type declarations for better development experience
- Fix Docker build environment variable validation issues
All shortcuts follow professional video editing standards (Avid/Premiere/Final Cut).
Context-aware shortcuts that don't interfere with text input fields.
Toast notifications provide user feedback for better UX.
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