fix: index page center-aligned layout for device card

miniprogram/pages/index/index.wxml

@@ -18,18 +18,14 @@
 
   <view class="page-content" wx:if="{{!loading && hasDevice}}">
     <view class="device-card">
-      <view class="device-card-top">
-        <view class="device-icon">💆</view>
-        <view class="device-info">
-          <view class="device-name">{{deviceName || '我的光面膜'}}</view>
-          <view class="device-meta">
-            <text class="status-badge status-badge-green" wx:if="{{connected}}">已连接</text>
-            <text class="status-badge" style="background:#ccc;" wx:else>未连接</text>
-            <text class="device-battery-text" wx:if="{{connected}}">🔋 {{battery}}%</text>
-          </view>
-        </view>
+      <view class="device-card-icon">💆</view>
+      <view class="device-card-name">{{deviceName || '光子美容仪'}}</view>
+      <view class="device-card-status">
+        <text class="status-badge status-badge-green" wx:if="{{connected}}">已连接</text>
+        <text class="status-badge" style="background:#ccc;" wx:else>未连接</text>
+        <text class="device-card-battery" wx:if="{{connected}}">🔋 {{battery}}%</text>
       </view>
-      <button class="btn-reconnect" bindtap="onConnectBle" wx:if="{{hasDevice && !connected}}">重新连接</button>
+      <button class="btn-reconnect" bindtap="onConnectBle" wx:if="{{!connected}}">重新连接</button>
     </view>
 
     <view class="sub-info" bindtap="onViewSubscription">