优化编号讲解布局与返回流程

- 将讲解编号置于标题上方并增强辨识度
- 编号详情返回后保留输入界面并清空原编号
- 增加页面栈丢失时恢复编号输入页的兜底逻辑
- 补充编号布局和返回流程回归测试

Made-with: Proma

src/pages/exhibit/detail.vue

@@ -247,6 +247,7 @@ const detailTextLoadedByLanguage = ref<Record<AudioLanguage, boolean>>({
 })
 const shouldUseHostNavigation = computed(() => isEmbeddedInWechatMiniProgram())
 const shouldAutoplayOnEntry = ref(false)
+const enteredByGuideCode = ref(false)
 
 const isAudioLanguage = (value: unknown): value is AudioLanguage => (
   value === 'zh-CN' || value === 'yue-HK' || value === 'en-US'
@@ -533,7 +534,9 @@ onLoad(async (options: any = {}) => {
   }
   const rawLang = Array.isArray(options.lang) ? options.lang[0] : options.lang
   const rawAutoplay = Array.isArray(options.autoplay) ? options.autoplay[0] : options.autoplay
+  const rawEntry = Array.isArray(options.entry) ? options.entry[0] : options.entry
   shouldAutoplayOnEntry.value = rawAutoplay === '1' || rawAutoplay === 'true'
+  enteredByGuideCode.value = rawEntry === 'code'
   const lang = typeof rawLang === 'string'
     ? normalizeGuideAudioLanguage(rawLang)
     : 'zh-CN'
@@ -935,6 +938,16 @@ const decodeRouteParam = (value: string) => {
   return decoded
 }
 
+const fallbackToCodeEntry = () => {
+  const url = '/pages/explain/list?codeEntry=1'
+  uni.redirectTo({
+    url,
+    fail: () => {
+      uni.reLaunch({ url })
+    }
+  })
+}
+
 const fallbackToExplainObjectList = () => {
   const hallId = detailEntryRequest.value?.hallId || exhibit.value.hallId
   const hallName = decodeRouteParam(detailEntryRequest.value?.hallName || exhibit.value.hallName || '讲解')
@@ -957,15 +970,27 @@ type ExplainDetailPageStackEntry = {
 const returnToExplainObjectList = () => {
   closeDetailAudioOnExit()
 
+  const pages = getCurrentPages()
+  const previousPage = pages[pages.length - 2] as ExplainDetailPageStackEntry | undefined
+
+  if (enteredByGuideCode.value) {
+    if (previousPage?.route === 'pages/explain/list' || previousPage?.route === 'pages/index/index') {
+      uni.navigateBack({
+        delta: 1,
+        fail: fallbackToCodeEntry
+      })
+      return
+    }
+    fallbackToCodeEntry()
+    return
+  }
+
   // H5 history can omit intermediate uni-app pages after a refresh or deep link.
   if (typeof window !== 'undefined' && window.location.hash.startsWith('#/')) {
     fallbackToExplainObjectList()
     return
   }
 
-  const pages = getCurrentPages()
-  const previousPage = pages[pages.length - 2] as ExplainDetailPageStackEntry | undefined
-
   if (previousPage?.route === 'pages/explain/guide-stop-list') {
     uni.navigateBack({
       delta: 1,