修复小程序内嵌页面标题同步

src/pages/index/index.vue

@@ -276,6 +276,7 @@ import {
   type GuideTopTab
 } from '@/utils/guideTopTabs'
 import { isEmbeddedInWechatMiniProgram } from '@/utils/hostEnvironment'
+import { syncHostNavigationTitle } from '@/utils/hostNavigationTitle'
 import {
   guideUseCase
 } from '@/usecases/guideUseCase'
@@ -419,6 +420,14 @@ let pendingPoiDetailUiContext: Readonly<{
 
 // 状态
 const currentTab = ref<GuideTopTab>(initialTopTab())
+const topTabNavigationTitle = (tab: GuideTopTab) => (
+  tab === 'explain' ? '免费讲解' : '地图导览'
+)
+
+watch(currentTab, (tab) => {
+  syncHostNavigationTitle(topTabNavigationTitle(tab))
+}, { immediate: true })
+
 const launchOverlayVisible = ref(shouldShowLaunchOverlay())
 const launchOverlayLeaving = ref(false)
 const launchProgress = ref(8)