feat: add command palette functionality and shortcuts

- Implemented command palette with keyboard shortcut (⌘K) for opening.
- Added commands for opening, closing, setting query, and selecting items in the command palette.
- Created tests for command palette commands and input handling.
- Enhanced layer actions with functions for adding, grouping, and deleting layers.
- Updated UI components to integrate command palette and shortcuts.

editor/state.ts

@@ -87,11 +87,18 @@ export type GenerationState = {
   compareMode: GenerationCompareMode;
 };
 
+export type CommandPaletteState = {
+  open: boolean;
+  query: string;
+  selectedIndex: number;
+};
+
 export type EditorState = {
   viewport: ViewportState;
   selection: SelectionState;
   tools: ToolState;
   generation: GenerationState;
+  commandPalette: CommandPaletteState;
   transformSession?: TransformSession;
   maskEdit?: MaskEditState;
   brushPreview?: BrushPreviewState;