fix: add back button and nav bar to wallet page

- Add van-nav-bar with back arrow to qianbao.wxml
- Fix JSON title from "我的收藏" to "我的钱包"
- Simplify JS: remove unused navHeight/menuButtonInfo, use getNavBarHeight()
- Add navigationStyle:custom for consistent custom nav bar

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

coupon/pages/wodeqianbao/qianbao.js

@@ -5,11 +5,7 @@ Page({
 
     data: {
         order_list: [],
-        navHeight: '',
-        menuButtonInfo: {},
-        searchMarginTop: 0,
-        searchWidth: 0,
-        searchHeight: 0,
+        height: '',
         page: 1,
         firstLoad: true
     },
@@ -18,8 +14,8 @@ Page({
         wx.navigateBack()
     },
 
-    onLoad: function (options) {
-        wx.setNavigationBarTitle({ title: '我的钱包' })
+    onLoad: function () {
+        this.setData(getApp().getNavBarHeight());
     },
 
     onShow: function () {

coupon/pages/wodeqianbao/qianbao.json

@@ -1,4 +1,7 @@
 {
-  "usingComponents": {},
-  "navigationBarTitleText": "我的收藏"
-}
+  "usingComponents": {
+    "van-nav-bar": "@vant/weapp/nav-bar/index"
+  },
+  "navigationBarTitleText": "我的钱包",
+  "navigationStyle": "custom"
+}

coupon/pages/wodeqianbao/qianbao.wxml

@@ -1,20 +1,28 @@
-<view>
-    <view class="order-list" wx:if="{{order_list.length}}">
-        <view wx:for="{{order_list}}" wx:key="{{index}}" wx:for-item="item">
-            <view class="Group" bindtap="activity" data-id="{{item.id}}">
-                <view style="margin-left: 34rpx;">
-                    <view wx:if="{{item.type==1}}" class="title1">退款到账</view>
-                    <view wx:if="{{item.type==-1}}" class="title1">提现</view>
-                    <view class="title2">{{item.time}}</view>
-                </view>
-                <view style="position: absolute;right: 24rpx;">
-                    <view class="Price1">￥{{item.money}}</view>
-                </view>
-            </view>
+<van-nav-bar
+  title="我的钱包"
+  left-text=""
+  left-arrow
+  bind:click-left="back"
+  style="position:fixed;left:0;top:0;width:100%;z-index:2;"
+/>
+
+<view style="margin-top:{{height}}px;">
+  <view class="order-list" wx:if="{{order_list.length}}">
+    <view wx:for="{{order_list}}" wx:key="{{index}}" wx:for-item="item">
+      <view class="Group" bindtap="activity" data-id="{{item.id}}">
+        <view style="margin-left: 34rpx;">
+          <view wx:if="{{item.type==1}}" class="title1">退款到账</view>
+          <view wx:if="{{item.type==-1}}" class="title1">提现</view>
+          <view class="title2">{{item.time}}</view>
         </view>
+        <view style="position: absolute;right: 24rpx;">
+          <view class="Price1">￥{{item.money}}</view>
+        </view>
+      </view>
     </view>
-    <view wx:else class="no-order" style="display:flex;flex-direction:column;align-items:center;padding-top:200rpx;">
-        <image style="width:200rpx;height:200rpx;" src="/pages/image/empty.png"></image>
-        <view style="color:#999;font-size:28rpx;margin-top:20rpx;">暂无交易记录</view>
-    </view>
-</view>
+  </view>
+  <view wx:else class="no-order" style="display:flex;flex-direction:column;align-items:center;padding-top:200rpx;">
+    <image style="width:200rpx;height:200rpx;" src="/pages/image/empty.png"></image>
+    <view style="color:#999;font-size:28rpx;margin-top:20rpx;">暂无交易记录</view>
+  </view>
+</view>