- Space toggles play/pause, sends play/pause msg to server
- ArrowLeft/ArrowRight seek +/-5s, send seek msg, clear preview strips
- Ctrl+Z calls timeline.history.undo()
- Ctrl+Shift+Z and Ctrl+Y both call timeline.history.redo()
- Ctrl+S prevents browser dialog, fetches show and POSTs to save
- All shortcuts suppressed when focus is on input/select/textarea
- Space skips when active element is a button (prevents double-toggle)
- wireKeyboard() called at init after wireAudio()
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