Right panel stays on previous shortcut after selection change

This is the most worrying item: editing one shortcut while looking at another's UI is a data-loss path. Likely candidates: (1) selectedKey state in App.jsx not updating because of a memoised child guard, (2) editor component holding internal draft state that doesn't reset when selectedKey prop changes (missing useEffect dependency or stale closure), (3) sidebar selection click being swallowed by another handler. Investigate before fixing.