fix: index page layout — separate badge from reconnect, space buttons

- Device card: top row with icon+name+badge, reconnect button below
- Action buttons wrapped in flex column with 20rpx gap
- Removed inline device-battery, now part of device-meta row

miniprogram/pages/index/index.wxml

@@ -18,15 +18,18 @@
 
   <view class="page-content" wx:if="{{!loading && hasDevice}}">
     <view class="device-card">
-      <view class="device-icon">💆</view>
-      <view class="device-name">{{deviceName || '我的光面膜'}}</view>
-      <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>
-      <button class="btn-secondary btn-sm" bindtap="onConnectBle" wx:if="{{hasDevice && !connected}}">重新连接</button>
-      <view class="device-battery" wx:if="{{connected}}">
-        <text>🔋</text>
-        <text>电量 {{battery}}%</text>
+      <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>
+      <button class="btn-reconnect" bindtap="onConnectBle" wx:if="{{hasDevice && !connected}}">重新连接</button>
     </view>
 
     <view class="sub-info" bindtap="onViewSubscription">
@@ -38,7 +41,9 @@
       <text class="sub-info-arrow">›</text>
     </view>
 
-    <button class="btn-primary" bindtap="onStartTreatment">开始护理</button>
-    <button class="btn-secondary" bindtap="onManageDevice">设备管理</button>
+    <view class="action-buttons">
+      <button class="btn-primary" bindtap="onStartTreatment">开始护理</button>
+      <button class="btn-secondary" bindtap="onManageDevice">设备管理</button>
+    </view>
   </view>
 </view>

miniprogram/pages/index/index.wxss

@@ -19,6 +19,69 @@
   border: none;
 }
 
+.device-card {
+  background: #fff;
+  border-radius: 16rpx;
+  padding: 28rpx;
+}
+
+.device-card-top {
+  display: flex;
+  align-items: center;
+  gap: 20rpx;
+}
+
+.device-icon {
+  font-size: 64rpx;
+  flex-shrink: 0;
+}
+
+.device-info {
+  flex: 1;
+}
+
+.device-name {
+  font-size: 32rpx;
+  font-weight: 600;
+  color: #333;
+  margin-bottom: 8rpx;
+}
+
+.device-meta {
+  display: flex;
+  align-items: center;
+  gap: 16rpx;
+}
+
+.device-battery-text {
+  font-size: 24rpx;
+  color: #666;
+}
+
+.btn-reconnect {
+  display: block;
+  width: 100%;
+  margin-top: 20rpx;
+  padding: 20rpx;
+  background: #f5f5f5;
+  color: #E6508C;
+  border: 2rpx solid #E6508C;
+  border-radius: 12rpx;
+  font-size: 28rpx;
+  text-align: center;
+}
+
+.btn-reconnect::after {
+  border: none;
+}
+
+.action-buttons {
+  margin-top: 30rpx;
+  display: flex;
+  flex-direction: column;
+  gap: 20rpx;
+}
+
 .sub-info {
   display: flex;
   justify-content: space-between;