feat: add loading animation on reconnect button, 5s timeout

miniprogram/pages/wear-check/wear-check.wxml

@@ -29,6 +29,6 @@
     </view>
 
     <button class="btn-primary" wx:if="{{connected}}" bindtap="onNext">确认已佩戴，开始检测</button>
-    <button class="btn-secondary" wx:if="{{!connected}}" bindtap="onRetry">重新连接</button>
+    <button class="btn-secondary" wx:if="{{!connected}}" bindtap="onRetry" disabled="{{reconnecting}}" loading="{{reconnecting}}">{{reconnecting ? '正在连接...' : '重新连接'}}</button>
   </view>
 </view>