init: add source code from src.zip

src/hooks/useCommandQueue.ts

@@ -0,0 +1,15 @@
+import { useSyncExternalStore } from 'react'
+import type { QueuedCommand } from '../types/textInputTypes.js'
+import {
+  getCommandQueueSnapshot,
+  subscribeToCommandQueue,
+} from '../utils/messageQueueManager.js'
+
+/**
+ * React hook to subscribe to the unified command queue.
+ * Returns a frozen array that only changes reference on mutation.
+ * Components re-render only when the queue changes.
+ */
+export function useCommandQueue(): readonly QueuedCommand[] {
+  return useSyncExternalStore(subscribeToCommandQueue, getCommandQueueSnapshot)
+}