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- 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.