fix(h5): hide in-page nav titles that duplicate WeChat chrome

Keep back buttons and header layout. mini-user only hides titles on H5; partner/shop hide .app-page-title and legal titles; shared PageHeader defaults showTitle=false.

apps/mini-user/src/components/TabMainHeader.tsx

@@ -7,13 +7,15 @@ type TabMainHeaderProps = {
   extra?: ReactNode;
 };
 
-/** Tab 页顶栏：适配刘海屏 + 微信胶囊避让 */
+const isH5 = process.env.TARO_ENV === 'h5';
+
+/** Tab 页顶栏：适配刘海屏 + 微信胶囊避让；H5 不展示标题（与微信系统标题重复） */
 export default function TabMainHeader({ title, extra }: TabMainHeaderProps) {
   const metrics = useNavBarMetrics();
 
   return (
-    <View className="tab-main-header" style={navBarStyle(metrics)}>
-      <Text className="tab-main-header__title">{title}</Text>
+    <View className="tab-main-header" style={navBarStyle(metrics)} aria-label={title}>
+      {!isH5 ? <Text className="tab-main-header__title">{title}</Text> : null}
       <View
         className="tab-main-header__content"
         style={tabNavContentStyle(metrics)}