fix: 修复 agents 页面侧边栏切回后自动关闭

docs/develop-guides/roadmap.md

@@ -57,6 +57,7 @@
 - 调整对话配置入口与侧边栏头尾交互：输入区配置按钮改为轻量 dropdown 触发器，默认保持透明、hover 才出现背景；下拉中直接提供配置切换、新建配置，以及查看/编辑当前配置的入口。配置侧边栏则移除头部配置切换和新建入口，改为仅显示当前配置名称、可点击星标和关闭图标，并将删除操作下沉到底部保存按钮右侧。
 - 为历史线程补充前端本地配置变更提示：当已有历史消息的对话中切换 Agent、切换配置或编辑任意配置项时，在聊天消息流中插入一条非持久化的信息提示，提醒继续在当前线程运行可能影响最终效果，建议新建对话；提示仅保留在前端当前线程状态中，不写入后端历史消息。后续补齐了 3 个关键边界：提示插入时主动滚动到底部确保可见、历史消息尚未加载完成时先挂起提示并在加载完成后落地、流式回复过程中切换配置时将提示锚定在当时完整对话流之后，避免把正在生成的回复错误归因到新配置。
 - 调整 Worker run 模式下的消息首屏反馈：前端发送消息时先乐观渲染用户消息，再将前端生成的 `request_id` 透传给 `/api/chat/runs` 与服务端 `init` 对账；“正在生成回复”动画改为仅在收到 `init` 确认后展示，修复 worker 轮询延迟导致的先转圈、后出现用户消息的问题。后续又补齐了线程切换场景：后端持久化 user message 时同步写入 `request_id`，前端在合并历史消息与 ongoing 消息时按 `request_id` 去掉重复的首条 human message，避免切回运行中的线程后出现连续两个 user message。
+- 修复 agents 页对话侧边栏在 `keep-alive` 路由切换后的误关闭问题：`AgentChatComponent` 的宽度监听现在会在页面 deactivated 时断开、activated 时重连，并忽略隐藏态的 `0` 宽度，避免从其他页面切回 `/agent` 时把用户持久化的侧边栏打开状态错误覆盖为关闭。
 
 ---
 

web/src/components/AgentChatComponent.vue

@@ -281,7 +281,18 @@
 </template>
 
 <script setup>
-import { ref, reactive, onMounted, watch, nextTick, computed, onUnmounted, h } from 'vue'
+import {
+  ref,
+  reactive,
+  onMounted,
+  watch,
+  nextTick,
+  computed,
+  onUnmounted,
+  onActivated,
+  onDeactivated,
+  h
+} from 'vue'
 import { message } from 'ant-design-vue'
 import AgentInputArea from '@/components/AgentInputArea.vue'
 import AgentMessageComponent from '@/components/AgentMessageComponent.vue'
@@ -902,6 +913,69 @@ const isSidebarFloating = ref(false)
 let chatMainResizeObserver = null
 // 初始化延迟标志，避免首次挂载时 ResizeObserver 立即触发导致侧边栏意外关闭
 let isResizeObserverReady = false
+let resizeObserverReadyTimer = null
+
+const armResizeObserver = () => {
+  if (resizeObserverReadyTimer) {
+    clearTimeout(resizeObserverReadyTimer)
+  }
+
+  isResizeObserverReady = false
+  // keep-alive 切页回来时等布局稳定后再恢复宽度判断，避免隐藏态宽度污染侧边栏状态。
+  resizeObserverReadyTimer = setTimeout(() => {
+    isResizeObserverReady = true
+  }, 50)
+}
+
+const stopChatMainResizeObserver = () => {
+  if (resizeObserverReadyTimer) {
+    clearTimeout(resizeObserverReadyTimer)
+    resizeObserverReadyTimer = null
+  }
+
+  isResizeObserverReady = false
+
+  if (chatMainResizeObserver) {
+    chatMainResizeObserver.disconnect()
+    chatMainResizeObserver = null
+  }
+}
+
+const startChatMainResizeObserver = () => {
+  if (!window.ResizeObserver || !chatMainRef.value || chatMainResizeObserver) {
+    return
+  }
+
+  localUIState.chatMainWidth = chatMainRef.value.clientWidth || window.innerWidth
+  chatMainResizeObserver = new ResizeObserver((entries) => {
+    // 初始化期间跳过检查，等待 layout 稳定
+    if (!isResizeObserverReady) return
+
+    for (const entry of entries) {
+      const width = entry.contentRect.width
+      if (!width) continue
+
+      localUIState.chatMainWidth = width
+      const isTakingSpace = chatUIStore.isSidebarOpen && !isSidebarFloating.value
+
+      if (isTakingSpace) {
+        if (width < 600) {
+          isSidebarFloating.value = true
+          chatUIStore.isSidebarOpen = false
+          localStorage.setItem('chat_sidebar_open', 'false')
+        }
+      } else {
+        if (width >= 880) {
+          isSidebarFloating.value = false
+        } else {
+          isSidebarFloating.value = true
+        }
+      }
+    }
+  })
+  chatMainResizeObserver.observe(chatMainRef.value)
+  armResizeObserver()
+}
 
 onMounted(() => {
   nextTick(() => {
@@ -910,50 +984,26 @@ onMounted(() => {
       chatMainContainer.addEventListener('scroll', scrollController.handleScroll, { passive: true })
     }
 
-    if (window.ResizeObserver && chatMainRef.value) {
-      localUIState.chatMainWidth = chatMainRef.value.clientWidth || window.innerWidth
-      chatMainResizeObserver = new ResizeObserver((entries) => {
-        // 初始化期间跳过检查，等待 layout 稳定
-        if (!isResizeObserverReady) return
-
-        for (const entry of entries) {
-          const width = entry.contentRect.width
-          localUIState.chatMainWidth = width
-          const isTakingSpace = chatUIStore.isSidebarOpen && !isSidebarFloating.value
-
-          if (isTakingSpace) {
-            if (width < 600) {
-              isSidebarFloating.value = true
-              chatUIStore.isSidebarOpen = false
-              localStorage.setItem('chat_sidebar_open', 'false')
-            }
-          } else {
-            if (width >= 880) {
-              isSidebarFloating.value = false
-            } else {
-              isSidebarFloating.value = true
-            }
-          }
-        }
-      })
-      chatMainResizeObserver.observe(chatMainRef.value)
-    }
-
-    // 延迟 50ms 后启用 ResizeObserver 检查，确保 layout 已稳定
-    setTimeout(() => {
-      isResizeObserverReady = true
-    }, 50)
+    startChatMainResizeObserver()
   })
   setTimeout(() => {
     localUIState.isInitialRender = false
   }, 300)
 })
 
+onActivated(() => {
+  nextTick(() => {
+    startChatMainResizeObserver()
+  })
+})
+
+onDeactivated(() => {
+  stopChatMainResizeObserver()
+})
+
 onUnmounted(() => {
   scrollController.cleanup()
-  if (chatMainResizeObserver) {
-    chatMainResizeObserver.disconnect()
-  }
+  stopChatMainResizeObserver()
   if (sendCooldownTimer) {
     clearTimeout(sendCooldownTimer)
     sendCooldownTimer = null