feat: records 页面接入骨架屏 + loading 状态

pages/records/records.wxml

@@ -1,4 +1,13 @@
 <view class="container page-enter" style="{{themeStyle}}">
+  <!-- 加载骨架屏 (200ms 最小显示) -->
+  <block wx:if="{{loading}}">
+    <ui-skeleton variant="card" />
+    <view style="height: 24rpx;" />
+    <ui-skeleton variant="card" />
+  </block>
+
+  <!-- 真实内容 (loading 时隐藏) -->
+  <view hidden="{{loading}}">
   <!-- 统计卡片 -->
   <ui-card variant="in">
     <view class="stats">
@@ -81,6 +90,8 @@
       </view>
     </view>
   </ui-card>
+  </view>
+  <!-- /hidden wrapper -->
 
   <!-- 日期详情弹窗 -->
   <ui-modal visible="{{showDayDetail}}" position="center" bind:close="onCloseDayDetail">