style(metronome): 禁止页面上下滚动

- pages.json 给 pages/training/metronome 加 disableScroll: true
  (微信小程序级别禁滚动,主要避免下拉刷新和顶部回弹)
- .page CSS 改 min-height → height: 100vh + overflow: hidden
  (双保险,防止 iOS 橡皮筋效果与内容超出滚动)
- 内容元素 gap 28→24rpx,微调避免内容被裁

Co-authored-by: Cursor <cursoragent@cursor.com>

TUICallKit-Vue3/pages.json

@@ -81,7 +81,8 @@
 			"style": {
 				"navigationBarTitleText": "节拍器",
 				"navigationBarBackgroundColor": "#0f172a",
-				"navigationBarTextStyle": "white"
+				"navigationBarTextStyle": "white",
+				"disableScroll": true
 			}
 		}
 	],

TUICallKit-Vue3/pages/training/metronome.vue

@@ -199,14 +199,16 @@ $radius-btn: 20rpx;
  * 页面容器
  * ============================================================ */
 .page {
-    min-height: 100vh;
+    height: 100vh;
+    box-sizing: border-box;
     padding: 30rpx 28rpx 60rpx;
     background: $bg-grad;
     display: flex;
     flex-direction: column;
     align-items: center;
-    gap: 28rpx;
+    gap: 24rpx;
     color: $text-1;
+    overflow: hidden;
 }
 
 /* ============================================================