fix: add 'tracks' category to CommandAction type

Added 'tracks' to the allowed command palette categories to fix TypeScript compilation error.

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Co-Authored-By: Claude <noreply@anthropic.com>

components/ui/CommandPalette.tsx

@@ -9,7 +9,7 @@ export interface CommandAction {
   label: string;
   description?: string;
   shortcut?: string;
-  category: 'edit' | 'playback' | 'file' | 'view' | 'effects';
+  category: 'edit' | 'playback' | 'file' | 'view' | 'effects' | 'tracks';
   action: () => void;
 }