Add Word Wrangler demos

examples/word-wrangler-gemini-live/client/src/utils/timerUtils.ts

@@ -0,0 +1,37 @@
+/**
+ * Safely clears any type of timer
+ * @param timer The timer to clear
+ * @returns null to reassign to the timer reference
+ */
+export function clearTimer(timer: NodeJS.Timeout | null): null {
+  if (timer) {
+    clearTimeout(timer);
+  }
+  return null;
+}
+
+/**
+ * Creates a countdown timer that calls the callback every second
+ * @returns A function to stop the timer
+ */
+export function createCountdownTimer(
+  durationSeconds: number,
+  onTick: (secondsLeft: number) => void,
+  onComplete: () => void
+): () => void {
+  let secondsLeft = durationSeconds;
+
+  const timer = setInterval(() => {
+    secondsLeft--;
+    onTick(secondsLeft);
+
+    if (secondsLeft <= 0) {
+      clearInterval(timer);
+      onComplete();
+    }
+  }, 1000);
+
+  return () => {
+    clearInterval(timer);
+  };
+}