fix rock mode

src/hand_landmark/gesture_handler.ts

@@ -500,6 +500,8 @@ export class GestureHandler {
    * 获取指定手指的指尖 landmark
    * fingerIndex: 0=拇指, 1=食指, 2=中指, ...
    */
+  private lastModeSwitchTime: number = 0;
+  private readonly MODE_SWITCH_INTERVAL = 3000; // 3秒  
   private getFingerTip(hand: HandInfo, fingerIndex: number) {
     if (!hand) return null;
 
@@ -519,9 +521,14 @@ export class GestureHandler {
       this.previousGestureCount = 1;
     }
 
-    const app_store = use_app_store();
 
-    if (gesture === HandGesture.ROCK_SWITCH_MODE) {
+ 
+  const app_store = use_app_store();
+  if (gesture === HandGesture.ROCK_SWITCH_MODE) {
+    const now = Date.now();
+    if (now - this.lastModeSwitchTime >= this.MODE_SWITCH_INTERVAL) {
+      this.lastModeSwitchTime = now;
+  
       if (app_store.mode === 'normal') {
         app_store.mode = 'music';
         app_store.sub_window_info("🎵 切换到音乐模式");
@@ -529,9 +536,9 @@ export class GestureHandler {
         app_store.mode = 'normal';
         app_store.sub_window_info("💼 切换到普通模式");
       }
-      return; // 切换后不继续处理其他手势
     }
-
+    return; // 不管有没有切换，都返回，不再处理其他手势
+  }