fix(review-tablet): 修复AI助手项目切换状态

src/views/review/tablet/index.vue

@@ -144,7 +144,7 @@
           <!-- 未生成 -->
           <div v-if="!aiSummary || aiSummary.status === 0" class="ai-summary-empty">
             <el-icon><InfoFilled /></el-icon>
-            <span>当前项目尚未生成 AI 摘要，请上传资料后自动触发生成</span>
+            <span>{{ aiSummary?.blockReason || '当前项目 AI 尚未就绪，请联系管理员先完成构建' }}</span>
           </div>
           <!-- 生成中 -->
           <div v-else-if="aiSummary.status === 1" class="ai-summary-building">
@@ -154,7 +154,7 @@
           <!-- 失败 -->
           <div v-else-if="aiSummary.status === 3" class="ai-summary-failed">
             <el-icon><WarningFilled /></el-icon>
-            <span>摘要生成失败：{{ aiSummary.errorMessage || '未知错误' }}</span>
+            <span>{{ aiSummary.blockReason || `摘要生成失败：${aiSummary.errorMessage || '未知错误'}` }}</span>
           </div>
           <!-- 已完成 -->
           <div v-else-if="aiSummary.status === 2 && aiSummary.summary" class="ai-summary-card">
@@ -268,7 +268,7 @@
 
         <!-- 摘要未就绪时提示 -->
         <div v-else-if="aiSummary && aiSummary.status !== 2" class="ai-chat-unavail">
-          AI 摘要就绪后才能开始对话
+          {{ aiSummary.blockReason || 'AI 摘要就绪后才能开始对话' }}
         </div>
       </aside>
     </div>
@@ -338,6 +338,12 @@ interface FileTreeNode {
   source: ReviewMeetingFileRespVO
 }
 
+interface ProjectAiState {
+  summary: ReviewAiSummaryVO | null
+  conversationId: number | null
+  messages: ChatMessageVO[]
+}
+
 // ── 目录 & 预览 state ─────────────────────────────────────────
 const pageLoading = ref(false)
 const previewLoading = ref(false)
@@ -393,8 +399,10 @@ const streamingLoading = ref(false)
 const aiMessagesRef = ref<HTMLElement>()
 let streamAbortCtrl: AbortController | null = null
 let summaryPollingTimer: ReturnType<typeof setTimeout> | null = null
+let aiLoadToken = 0
 let officeWarmupTimers: ReturnType<typeof setTimeout>[] = []
 let previewFrameTimeoutTimer: ReturnType<typeof setTimeout> | null = null
+const aiProjectCache = ref<Record<number, ProjectAiState>>({})
 
 // ── 搜索过滤 ──────────────────────────────────────────────────
 watch(keyword, (val) => treeRef.value?.filter(val.trim()))
@@ -529,14 +537,24 @@ const handleNodeCollapse = (data: TreeNode) => {
 
 const handleNodeClick = async (data: TreeNode) => {
   if (data.type === 'project') {
+    persistCurrentProjectAiState()
     const switched = activeProjectId.value !== data.projectId
     activeProjectId.value = data.projectId
     await loadProjectFiles(data)
-    if (switched) resetProjectAiState()
+    if (switched && aiPanelOpen.value) {
-    if (aiPanelOpen.value) await loadProjectAi(data.projectId)
+      restoreOrLoadProjectAi(data.projectId)
+    }
+    if (!switched && aiPanelOpen.value) {
+      restoreOrLoadProjectAi(data.projectId)
+    }
     return
   }
+  persistCurrentProjectAiState()
+  const switched = activeProjectId.value !== data.projectId
   await selectFileNode(data)
+  if (aiPanelOpen.value && (switched || !aiSummary.value)) {
+    restoreOrLoadProjectAi(data.projectId)
+  }
 }
 
 // ── 目录加载 ──────────────────────────────────────────────────
@@ -571,7 +589,7 @@ const loadCatalog = async () => {
 const toggleAiPanel = async () => {
   aiPanelOpen.value = !aiPanelOpen.value
   if (aiPanelOpen.value && activeProjectId.value) {
-    await loadProjectAi(activeProjectId.value)
+    restoreOrLoadProjectAi(activeProjectId.value)
   }
 }
 
@@ -585,11 +603,47 @@ const resetProjectAiState = () => {
   streamingText.value = ''
 }
 
+const persistCurrentProjectAiState = () => {
+  const projectId = activeProjectId.value
+  if (!projectId) return
+  aiProjectCache.value[projectId] = {
+    summary: aiSummary.value,
+    conversationId: aiConversationId.value,
+    messages: [...aiMessages.value]
+  }
+}
+
+const applyProjectAiState = (state?: ProjectAiState) => {
+  resetProjectAiState()
+  aiSummary.value = state?.summary ?? null
+  aiConversationId.value = state?.conversationId ?? null
+  aiMessages.value = state?.messages ? [...state.messages] : []
+}
+
+const restoreOrLoadProjectAi = (projectId: number) => {
+  const cached = aiProjectCache.value[projectId]
+  if (cached) {
+    applyProjectAiState(cached)
+    if (cached.summary?.status === AI_SUMMARY_STATUS.BUILDING) {
+      startSummaryPolling(projectId)
+    } else if (cached.summary?.status !== AI_SUMMARY_STATUS.SUCCESS) {
+      loadProjectAi(projectId)
+    }
+    scrollAiToBottom()
+    return
+  }
+  loadProjectAi(projectId)
+}
+
 const loadProjectAi = async (projectId: number) => {
   resetProjectAiState()
   aiSummaryLoading.value = true
+  const token = ++aiLoadToken
   try {
-    aiSummary.value = await getProjectAiSummary(projectId)
+    const summary = await getProjectAiSummary(projectId)
+    if (token !== aiLoadToken || activeProjectId.value !== projectId) return
+    aiSummary.value = summary
+    persistCurrentProjectAiState()
     // 如果生成中，开启轮询
     if (aiSummary.value?.status === AI_SUMMARY_STATUS.BUILDING) {
       startSummaryPolling(projectId)
@@ -608,11 +662,15 @@ const loadProjectAi = async (projectId: number) => {
 
 const openAndLoadConversation = async (projectId: number) => {
   aiChatLoading.value = true
+  const token = aiLoadToken
   try {
     const conv = await openProjectAiConversation(projectId)
+    if (token !== aiLoadToken || activeProjectId.value !== projectId) return
     aiConversationId.value = conv.conversationId
     const msgs = await ChatMessageApi.getChatMessageListByConversationId(conv.conversationId)
+    if (token !== aiLoadToken || activeProjectId.value !== projectId) return
     aiMessages.value = msgs || []
+    persistCurrentProjectAiState()
     await scrollAiToBottom()
   } catch {
     // 会话打开失败不影响主流程
@@ -628,6 +686,7 @@ const startSummaryPolling = (projectId: number) => {
     if (activeProjectId.value !== projectId || !aiPanelOpen.value) return
     try {
       aiSummary.value = await getProjectAiSummary(projectId)
+      persistCurrentProjectAiState()
     } catch { /* silent */ }
     if (aiSummary.value?.status === AI_SUMMARY_STATUS.BUILDING) {
       startSummaryPolling(projectId)
@@ -679,6 +738,7 @@ const handleSend = async () => {
           // 用真实 send 消息替换假消息
           aiMessages.value.pop()
           aiMessages.value.push(data.send)
+          persistCurrentProjectAiState()
         }
         if (data?.receive?.content) {
           streamingText.value += data.receive.content
@@ -699,6 +759,7 @@ const handleSend = async () => {
             createTime: new Date()
           } as any)
           streamingText.value = ''
+          persistCurrentProjectAiState()
         }
         streamingLoading.value = false
         await scrollAiToBottom()
@@ -719,6 +780,7 @@ const stopStream = () => {
       createTime: new Date()
     } as any)
     streamingText.value = ''
+    persistCurrentProjectAiState()
   }
   streamingLoading.value = false
 }
@@ -729,6 +791,7 @@ const handleClearMessages = async () => {
   stopStream()
   await clearProjectAiMessages(activeProjectId.value)
   aiMessages.value = []
+  persistCurrentProjectAiState()
   ElMessage.success('问答记录已清空')
 }