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.

input/command-palette.ts

@@ -0,0 +1,12 @@
+import { commandIds } from "@commands/ids";
+import type { Dispatch } from "@commands/dispatcher";
+import type { KeybindEvent } from "./keyboard";
+
+export function handleCommandPaletteKey(options: { event: KeybindEvent; dispatch: Dispatch }): boolean {
+  if (options.event.altKey || options.event.shiftKey) return false;
+  const modifier = options.event.metaKey || options.event.ctrlKey;
+  if (!modifier || options.event.key.toLowerCase() !== "k") return false;
+
+  options.dispatch(commandIds.commandPaletteOpen, undefined);
+  return true;
+}