feat(前端)：AI 操作超时 + 加载提示

- axios 全局超时 5s → 180s（3 分钟），避免 AI 响应未到即断开
- 回忆对比按钮等待时显示旋转动画 + 已等待秒数 + 30s 后安抚文案
- 结束会话报告草稿生成时显示等待提示 + 秒数统计

src/components/ReviewRecall.vue

@@ -20,6 +20,8 @@ const taskNum = computed(() => route.params.taskNum as string);
 const loading = ref(false);
 const standard = ref<StandardMindMap | null>(null);
 const comparing = ref(false);
+const comparingSeconds = ref(0);
+let comparingTimer: ReturnType<typeof setInterval> | null = null;
 const lastResult = ref<any>(null);
 const hasCompared = ref(false);
 
@@ -139,6 +141,8 @@ const handleRecallCompare = async () => {
     return;
   }
   comparing.value = true;
+  comparingSeconds.value = 0;
+  comparingTimer = setInterval(() => { comparingSeconds.value++; }, 1000);
   try {
     const res = await recallCompare(taskNum.value, outline);
     standard.value = res?.data || null;
@@ -162,6 +166,7 @@ const handleRecallCompare = async () => {
     ElMessage.error(e.message || "对比失败");
   } finally {
     comparing.value = false;
+    if (comparingTimer) { clearInterval(comparingTimer); comparingTimer = null; }
   }
 };
 
@@ -328,6 +333,10 @@ onMounted(() => {
             清空重写
           </el-button>
         </div>
+        <p v-if="comparing" class="ai-waiting">
+          AI 正在对比分析中，已等待 {{ comparingSeconds }} 秒…
+          <template v-if="comparingSeconds > 30">内容较多，请耐心等待</template>
+        </p>
       </div>
       <p class="panel-hint">
         凭记忆在导图上补全该任务的知识点：选中节点后 Tab 加子节点、Enter 加同级节点、双击修改文字。
@@ -530,6 +539,29 @@ onMounted(() => {
   line-height: 1.5;
 }
 
+.ai-waiting {
+  font-size: 13px;
+  color: #e6a23c;
+  margin: 4px 0 0;
+  display: flex;
+  align-items: center;
+  gap: 6px;
+}
+
+.ai-waiting::before {
+  content: "";
+  width: 14px;
+  height: 14px;
+  border: 2px solid #f3d19e;
+  border-top-color: #e6a23c;
+  border-radius: 50%;
+  animation: spin 0.8s linear infinite;
+}
+
+@keyframes spin {
+  to { transform: rotate(360deg); }
+}
+
 .standard-meta {
   display: flex;
   gap: 12px;