fix(miniprogram): unify nav headers to dashboard style with tall workbench bar

Co-authored-by: Cursor <cursoragent@cursor.com>

miniprogram/pages/bx/all/list.vue

@@ -2,9 +2,7 @@
   <view class="bx-page">
     <view class="topbar" :style="safeAreaStyle">
       <view class="topbar-left">
-        <view class="topbar-back" @click="goBack">
-          <text class="topbar-back-icon">‹</text>
-        </view>
+        <text class="topbar-back" @click="goBack">←</text>
         <text class="topbar-title">全部申请单</text>
       </view>
       <view class="topbar-right" />