diff --git a/src/components/AiChat.vue b/src/components/AiChat.vue
index 5f7441a..6805310 100644
--- a/src/components/AiChat.vue
+++ b/src/components/AiChat.vue
@@ -1,208 +1,12 @@
 <template>
   <div class="ai-panel">
-    <!-- ═══ 对话侧边栏 ═══ -->
-    <transition name="sidebar-slide">
-      <div
-        v-if="store.state.sidebarOpen"
-        class="ai-conv-sidebar"
-        :style="{ '--sidebar-width': store.state.sidebarWidth + 'px' }"
-      >
-        <!-- 侧栏右边缘拖拽条(UX-2025-16):col-resize,拖动 mousemove 改 sidebarWidth,mouseup 持久化 -->
-        <div
-          class="ai-sidebar-resize-handle"
-          :title="t('aiChat.sidebarResizeHint')"
-          @mousedown.prevent="onResizeStart"
-        />
-        <div class="ai-conv-sidebar-header">
-          <span class="ai-conv-sidebar-title">{{ $t('aiChat.sidebarTitle') }}</span>
-          <button class="ai-btn-icon" @click="confirmNewConversation" :title="$t('aiChat.newConversation')">
-            <svg width="13" height="13" viewBox="0 0 24 24" fill="none" stroke="currentColor" stroke-width="1.8" stroke-linecap="round" stroke-linejoin="round"><line x1="12" y1="5" x2="12" y2="19"/><line x1="5" y1="12" x2="19" y2="12"/></svg>
-          </button>
-        </div>
-        <!-- UX-06 §3.1: 对话搜索框(v-model 双绑 store.searchQuery;Ctrl+K 聚焦) -->
-        <div class="ai-conv-search">
-          <svg class="ai-conv-search-icon" width="12" height="12" viewBox="0 0 24 24" fill="none" stroke="currentColor" stroke-width="2" stroke-linecap="round" stroke-linejoin="round"><circle cx="11" cy="11" r="8"/><line x1="21" y1="21" x2="16.65" y2="16.65"/></svg>
-          <input
-            ref="searchInputRef"
-            v-model="store.state.searchQuery"
-            class="ai-conv-search-input"
-            :placeholder="$t('aiChat.searchPlaceholder')"
-            :title="$t('aiChat.searchShortcutHint')"
-            type="text"
-          />
-          <kbd class="ai-conv-search-kbd">{{ $t('aiChat.searchShortcutHint') }}</kbd>
-        </div>
-        <div class="ai-conv-list">
-          <!-- UX-06 §3.1: 搜索态(searchResults 非 null)→ 平铺,活跃+归档全量按 updated_at DESC -->
-          <template v-if="searchResults">
-            <div
-              v-for="conv in searchResults"
-              :key="'s-' + conv.id"
-              class="ai-conv-item"
-              :class="{
-                'ai-conv-item--active': conv.id === store.state.activeConversationId,
-                'ai-conv-item--archived': conv.archived,
-              }"
-              @click="onSelectSearchResult(conv.id)"
-            >
-              <div class="ai-conv-item-main">
-                <span class="ai-conv-item-title" :title="conv.title || ''">{{ conv.title || $t('aiChat.newConversation') }}</span>
-                <span class="ai-conv-item-time">{{ formatTime(conv.updated_at) }}</span>
-              </div>
-              <div class="ai-conv-item-actions">
-                <button class="ai-conv-item-act" :class="{ 'ai-conv-item-act--pinned': conv.pinned }" @click.stop="store.setPinnedConversation(conv.id, !conv.pinned)" :title="conv.pinned ? $t('aiChat.unpinConversation') : $t('aiChat.pinConversation')">
-                  <svg width="10" height="10" viewBox="0 0 24 24" :fill="conv.pinned ? 'currentColor' : 'none'" stroke="currentColor" stroke-width="2" stroke-linecap="round" stroke-linejoin="round"><path d="M12 17v5"/><path d="M9 10.76a2 2 0 01-1.11 1.79l-1.78.9A2 2 0 005 15.24V16a1 1 0 001 1h12a1 1 0 001-1v-.76a2 2 0 00-1.11-1.79l-1.78-.9A2 2 0 0115 10.76V7a1 1 0 011-1 2 2 0 002-2V3H6v1a2 2 0 002 2 1 1 0 011 1z"/></svg>
-                </button>
-                <button class="ai-conv-item-act" @click.stop="store.archiveConversation(conv.id, !conv.archived)" :title="conv.archived ? $t('aiChat.unarchive') : $t('aiChat.archive')">
-                  <svg width="10" height="10" viewBox="0 0 24 24" fill="none" stroke="currentColor" stroke-width="2" stroke-linecap="round" stroke-linejoin="round"><rect x="2" y="4" width="20" height="5" rx="1"/><path d="M4 9v9a2 2 0 002 2h12a2 2 0 002-2V9"/><line x1="10" y1="13" x2="14" y2="13"/></svg>
-                </button>
-                <div class="ai-conv-item-export">
-                  <button class="ai-conv-item-act" @click.stop="toggleExportMenu(conv.id)" :title="$t('aiChat.exportConversation')" :disabled="exportingId === conv.id">
-                    <svg width="10" height="10" viewBox="0 0 24 24" fill="none" stroke="currentColor" stroke-width="2" stroke-linecap="round" stroke-linejoin="round"><path d="M21 15v4a2 2 0 01-2 2H5a2 2 0 01-2-2v-4"/><polyline points="7 10 12 15 17 10"/><line x1="12" y1="15" x2="12" y2="3"/></svg>
-                  </button>
-                  <div v-if="exportOpenId === conv.id" class="ai-conv-export-menu">
-                    <button class="ai-conv-export-opt" @click.stop="exportConversation(conv, 'markdown')">{{ $t('aiChat.exportMarkdown') }}</button>
-                    <button class="ai-conv-export-opt" @click.stop="exportConversation(conv, 'json')">{{ $t('aiChat.exportJson') }}</button>
-                    <button class="ai-conv-export-opt" @click.stop="exportConversation(conv, 'txt')">{{ $t('aiChat.exportTxt') }}</button>
-                  </div>
-                </div>
-                <button class="ai-conv-item-act" @click.stop="confirmDeleteConversation(conv.id)" :title="$t('common.delete')">
-                  <svg width="10" height="10" viewBox="0 0 24 24" fill="none" stroke="currentColor" stroke-width="2" stroke-linecap="round" stroke-linejoin="round"><line x1="18" y1="6" x2="6" y2="18"/><line x1="6" y1="6" x2="18" y2="18"/></svg>
-                </button>
-              </div>
-            </div>
-            <div v-if="searchResults.length === 0" class="ai-conv-empty">
-              {{ $t('aiChat.searchEmpty') }}
-            </div>
-          </template>
-
-          <!-- 非搜索态:原时间分组(活跃) + 归档分组 -->
-          <template v-else>
-            <!-- 活跃对话:按 今天/昨天/更早 分组 -->
-            <template v-for="group in groupedActive" :key="'g-' + group.key">
-              <div
-                class="ai-conv-group-title ai-conv-group-title--fold"
-                @click="store.toggleGroupFold(group.key)"
-              >
-                <span class="ai-conv-group-arrow" :class="{ 'is-folded': store.state.foldedGroups[group.key] }">▸</span>
-                {{ group.label }}
-                <span class="ai-conv-group-count">({{ group.items.length }})</span>
-              </div>
-              <div
-                v-if="group.key === 'today' && !group.items.length"
-                v-show="!store.state.foldedGroups[group.key]"
-                class="ai-conv-group-empty"
-              >{{ $t('aiChat.groupEmpty') }}</div>
-              <div
-                v-for="conv in group.items"
-                v-show="!store.state.foldedGroups[group.key]"
-                :key="conv.id"
-                class="ai-conv-item"
-                :class="{ 'ai-conv-item--active': conv.id === store.state.activeConversationId }"
-                @click="store.switchConversation(conv.id)"
-              >
-                <div class="ai-conv-item-main">
-                  <input
-                    v-if="editingConvId === conv.id"
-                    :ref="setEditEl"
-                    v-model="editText"
-                    class="ai-conv-item-edit"
-                    @keyup.enter="commitRename(conv.id)"
-                    @keyup.esc="cancelRename"
-                    @blur="commitRename(conv.id)"
-                    @click.stop
-                  />
-                  <span
-                    v-else
-                    class="ai-conv-item-title"
-                    :class="{ 'ai-conv-item-title--flash': titleFlash && conv.id === store.state.activeConversationId }"
-                    @dblclick.stop="startRename(conv)"
-                    :title="conv.title || $t('aiChat.doubleClickToRename')"
-                  >
-                    {{ conv.title || $t('aiChat.newConversation') }}
-                    <!-- UX-2025-20 §7.4:AI 生成标题标识小图标(标题非空非占位时显示) -->
-                    <svg
-                      v-if="conv.title && titleFlash && conv.id === store.state.activeConversationId"
-                      class="ai-conv-item-title-badge"
-                      width="9" height="9" viewBox="0 0 24 24" fill="none" stroke="currentColor" stroke-width="2.5" stroke-linecap="round" stroke-linejoin="round"
-                    ><polyline points="20 6 9 17 4 12"/></svg>
-                  </span>
-                  <span class="ai-conv-item-time">{{ formatTime(conv.updated_at) }}</span>
-                </div>
-                <div class="ai-conv-item-actions">
-                  <button class="ai-conv-item-act" :class="{ 'ai-conv-item-act--pinned': conv.pinned }" @click.stop="store.setPinnedConversation(conv.id, !conv.pinned)" :title="conv.pinned ? $t('aiChat.unpinConversation') : $t('aiChat.pinConversation')">
-                    <svg width="10" height="10" viewBox="0 0 24 24" :fill="conv.pinned ? 'currentColor' : 'none'" stroke="currentColor" stroke-width="2" stroke-linecap="round" stroke-linejoin="round"><path d="M12 17v5"/><path d="M9 10.76a2 2 0 01-1.11 1.79l-1.78.9A2 2 0 005 15.24V16a1 1 0 001 1h12a1 1 0 001-1v-.76a2 2 0 00-1.11-1.79l-1.78-.9A2 2 0 0115 10.76V7a1 1 0 011-1 2 2 0 002-2V3H6v1a2 2 0 002 2 1 1 0 011 1z"/></svg>
-                  </button>
-                  <button class="ai-conv-item-act" @click.stop="store.archiveConversation(conv.id, true)" :title="$t('aiChat.archive')">
-                    <svg width="10" height="10" viewBox="0 0 24 24" fill="none" stroke="currentColor" stroke-width="2" stroke-linecap="round" stroke-linejoin="round"><rect x="2" y="4" width="20" height="5" rx="1"/><path d="M4 9v9a2 2 0 002 2h12a2 2 0 002-2V9"/><line x1="10" y1="13" x2="14" y2="13"/></svg>
-                  </button>
-                  <div class="ai-conv-item-export">
-                    <button class="ai-conv-item-act" @click.stop="toggleExportMenu(conv.id)" :title="$t('aiChat.exportConversation')" :disabled="exportingId === conv.id">
-                      <svg width="10" height="10" viewBox="0 0 24 24" fill="none" stroke="currentColor" stroke-width="2" stroke-linecap="round" stroke-linejoin="round"><path d="M21 15v4a2 2 0 01-2 2H5a2 2 0 01-2-2v-4"/><polyline points="7 10 12 15 17 10"/><line x1="12" y1="15" x2="12" y2="3"/></svg>
-                    </button>
-                    <div v-if="exportOpenId === conv.id" class="ai-conv-export-menu">
-                      <button class="ai-conv-export-opt" @click.stop="exportConversation(conv, 'markdown')">{{ $t('aiChat.exportMarkdown') }}</button>
-                      <button class="ai-conv-export-opt" @click.stop="exportConversation(conv, 'json')">{{ $t('aiChat.exportJson') }}</button>
-                      <button class="ai-conv-export-opt" @click.stop="exportConversation(conv, 'txt')">{{ $t('aiChat.exportTxt') }}</button>
-                    </div>
-                  </div>
-                  <button class="ai-conv-item-act" @click.stop="confirmDeleteConversation(conv.id)" :title="$t('common.delete')">
-                    <svg width="10" height="10" viewBox="0 0 24 24" fill="none" stroke="currentColor" stroke-width="2" stroke-linecap="round" stroke-linejoin="round"><line x1="18" y1="6" x2="6" y2="18"/><line x1="6" y1="6" x2="18" y2="18"/></svg>
-                  </button>
-                </div>
-              </div>
-            </template>
-
-            <!-- 归档分组(可折叠) -->
-            <template v-if="archivedConvs.length">
-              <div class="ai-conv-group-title ai-conv-group-title--fold" @click="store.toggleArchivedFold()">
-                <span class="ai-conv-group-arrow" :class="{ 'is-folded': store.state.archivedCollapsed }">▸</span>
-                {{ $t('aiChat.archivedCount', { n: archivedConvs.length }) }}
-              </div>
-              <div
-                v-for="conv in archivedConvs"
-                v-show="!store.state.archivedCollapsed"
-                :key="'a-' + conv.id"
-                class="ai-conv-item ai-conv-item--archived"
-                :class="{ 'ai-conv-item--active': conv.id === store.state.activeConversationId }"
-                @click="store.switchConversation(conv.id)"
-              >
-                <div class="ai-conv-item-main">
-                  <span class="ai-conv-item-title" :title="conv.title || ''">{{ conv.title || $t('aiChat.newConversation') }}</span>
-                  <span class="ai-conv-item-time">{{ formatTime(conv.updated_at) }}</span>
-                </div>
-                <div class="ai-conv-item-actions">
-                  <button class="ai-conv-item-act" :class="{ 'ai-conv-item-act--pinned': conv.pinned }" @click.stop="store.setPinnedConversation(conv.id, !conv.pinned)" :title="conv.pinned ? $t('aiChat.unpinConversation') : $t('aiChat.pinConversation')">
-                    <svg width="10" height="10" viewBox="0 0 24 24" :fill="conv.pinned ? 'currentColor' : 'none'" stroke="currentColor" stroke-width="2" stroke-linecap="round" stroke-linejoin="round"><path d="M12 17v5"/><path d="M9 10.76a2 2 0 01-1.11 1.79l-1.78.9A2 2 0 005 15.24V16a1 1 0 001 1h12a1 1 0 001-1v-.76a2 2 0 00-1.11-1.79l-1.78-.9A2 2 0 0115 10.76V7a1 1 0 011-1 2 2 0 002-2V3H6v1a2 2 0 002 2 1 1 0 011 1z"/></svg>
-                  </button>
-                  <button class="ai-conv-item-act" @click.stop="store.archiveConversation(conv.id, false)" :title="$t('aiChat.unarchive')">
-                    <svg width="10" height="10" viewBox="0 0 24 24" fill="none" stroke="currentColor" stroke-width="2" stroke-linecap="round" stroke-linejoin="round"><rect x="2" y="4" width="20" height="5" rx="1"/><path d="M4 9v9a2 2 0 002 2h12a2 2 0 002-2V9"/><line x1="12" y1="13" x2="12" y2="17"/><polyline points="10 15 12 13 14 15"/></svg>
-                  </button>
-                  <div class="ai-conv-item-export">
-                    <button class="ai-conv-item-act" @click.stop="toggleExportMenu(conv.id)" :title="$t('aiChat.exportConversation')" :disabled="exportingId === conv.id">
-                      <svg width="10" height="10" viewBox="0 0 24 24" fill="none" stroke="currentColor" stroke-width="2" stroke-linecap="round" stroke-linejoin="round"><path d="M21 15v4a2 2 0 01-2 2H5a2 2 0 01-2-2v-4"/><polyline points="7 10 12 15 17 10"/><line x1="12" y1="15" x2="12" y2="3"/></svg>
-                    </button>
-                    <div v-if="exportOpenId === conv.id" class="ai-conv-export-menu">
-                      <button class="ai-conv-export-opt" @click.stop="exportConversation(conv, 'markdown')">{{ $t('aiChat.exportMarkdown') }}</button>
-                      <button class="ai-conv-export-opt" @click.stop="exportConversation(conv, 'json')">{{ $t('aiChat.exportJson') }}</button>
-                      <button class="ai-conv-export-opt" @click.stop="exportConversation(conv, 'txt')">{{ $t('aiChat.exportTxt') }}</button>
-                    </div>
-                  </div>
-                  <button class="ai-conv-item-act" @click.stop="confirmDeleteConversation(conv.id)" :title="$t('common.delete')">
-                    <svg width="10" height="10" viewBox="0 0 24 24" fill="none" stroke="currentColor" stroke-width="2" stroke-linecap="round" stroke-linejoin="round"><line x1="18" y1="6" x2="6" y2="18"/><line x1="6" y1="6" x2="18" y2="18"/></svg>
-                  </button>
-                </div>
-              </div>
-            </template>
-
-            <div v-if="store.state.conversations.length === 0" class="ai-conv-empty">
-              {{ $t('aiChat.emptyConversation') }}
-            </div>
-          </template>
-        </div>
-      </div>
-    </transition>
-
+    <!-- ═══ 对话侧边栏(第一批抽离至 ai/ConversationSidebar.vue,零行为变更) ═══ -->
+    <ConversationSidebar
+      ref="convSidebarRef"
+      @confirm-delete="confirmDeleteConversation"
+      @confirm-new-conversation="confirmNewConversation"
+      @export-error="(msg: string) => showToast(msg, 'error')"
+    />
     <!-- ═══ 聊天区域 ═══ -->
     <div class="ai-chat-area">
       <!-- Header -->
@@ -790,12 +594,13 @@ import { useAiStore } from '../stores/ai'
 import { pendingMaxRounds } from '../composables/ai/useAiEvents'
 import { aiApi } from '../api'
 import ConfirmDialog from './ConfirmDialog.vue'
+import ConversationSidebar from './ai/ConversationSidebar.vue'
 import { useConfirm } from '../composables/useConfirm'
 import { useMarkdown } from '../composables/useMarkdown'
 import ToolCardList from './ToolCardList.vue'
 import { formatRelativeZh, formatDate } from '../utils/time'
 import { useProjectStore } from '../stores/project'
-import type { AiConversationSummary, AiMessage, ContentPart, SkillInfo, ProjectRecord, TaskRecord } from '../api/types'
+import type { AiMessage, ContentPart, SkillInfo, ProjectRecord, TaskRecord } from '../api/types'
 
 const props = defineProps<{
   detached?: boolean
@@ -970,29 +775,6 @@ async function sendExamplePrompt(i18nKey: string) {
   await handleSend()
 }
 
-// 标题生成淡入(UX-2025-20 §7.4):监听当前对话标题从空→非空(后端自动生成标题,
-// loadConversations 回填侧栏触发),置 titleFlash=true 驱动 CSS opacity/transform 过渡,
-// 0.3s 后复位允许下次再触发。仅侧栏可见且当前对话项命中时该 class 生效。
-const titleFlash = ref(false)
-let _titleFlashTimer: ReturnType<typeof setTimeout> | null = null
-const activeConv = computed(() =>
-  store.state.conversations.find(c => c.id === store.state.activeConversationId) || null,
-)
-watch(
-  () => activeConv.value?.title,
-  (newTitle, oldTitle) => {
-    // 仅在 标题被生成填充(空/undefined → 非空非"新对话"占位) 时触发淡入;
-    // 用户手动 rename / 切换对话 / 标题无变化 不触发。
-    if (!newTitle) return
-    if (oldTitle && oldTitle === newTitle) return
-    // 切换对话旧 title 非空 → 新 title 非空:不视为"生成",跳过(避免切换闪动)
-    if (oldTitle) return
-    titleFlash.value = true
-    if (_titleFlashTimer) clearTimeout(_titleFlashTimer)
-    _titleFlashTimer = setTimeout(() => { titleFlash.value = false }, 320)
-  },
-)
-
 // ── 错误 toast(零依赖,复用 Settings.vue 同款 reactive toast) ──
 // AiChat 可能以分离窗口运行(App.vue 根 toast 不在 DOM 中),故本组件自管一个 toast;
 // i18n 不在本任务白名单,文案硬编码,后续补 aiChat.toastSendFail key
@@ -1173,15 +955,6 @@ async function confirmDeleteConversation(id: string) {
   store.deleteConversation(id)
 }
 
-/**
- * UX-260617-23:搜索结果点击切对话后清空 searchQuery,退出搜索模式回原时间分组视图。
- * 原实现只 switchConversation 不清 searchQuery → 切回的对话在搜索态平铺里,无法回到分组浏览。
- */
-function onSelectSearchResult(id: string) {
-  void store.switchConversation(id)
-  store.state.searchQuery = ''
-}
-
 /** 清空当前对话(真删 DB messages,带二次确认防误删) */
 async function confirmClearChat() {
   if (!await confirmDialog(t('aiChat.confirmClearChat'))) return
@@ -1402,98 +1175,8 @@ function selectMention(item: MentionItem) {
   })
 }
 
-// 对话项 inline 重命名
-const editingConvId = ref<string | null>(null)
-const editText = ref('')
-// 重命名 input 元素引用。该 input 在 v-for 内且由 v-if(editingConvId===conv.id) 单实例化,
-// 字符串 ref 在 v-for 中会被收集成数组(.focus/.select 失效),改用函数 ref 直接持有单个元素。
-let editEl: HTMLInputElement | null = null
-function setEditEl(el: Element | { $el?: Element } | null): void {
-  editEl = (el as HTMLInputElement) || null
-}
-
-// UX-06 §3.1: 对话搜索框引用(Ctrl+K 聚焦用)
-const searchInputRef = ref<HTMLInputElement>()
-
-function startRename(conv: { id: string; title: string | null }) {
-  editingConvId.value = conv.id
-  editText.value = conv.title || ''
-  nextTick(() => {
-    editEl?.focus()
-    editEl?.select()
-  })
-}
-
-async function commitRename(id: string) {
-  const title = editText.value.trim()
-  if (title && editingConvId.value === id) {
-    await store.renameConversation(id, title)
-  }
-  editingConvId.value = null
-}
-
-function cancelRename() {
-  editingConvId.value = null
-}
-
-// ── UX-18: 对话导出(消费 batch46 ai_conversation_export IPC) ──
-// 侧栏 hover 浮出导出按钮 → 点开格式小菜单(markdown/json/txt) → 选格式下载文件。
-// 状态:exportOpenId 控制当前展开的菜单(同一时刻最多一个);exportingId 防重复点击。
-const exportOpenId = ref<string | null>(null)
-const exportingId = ref<string | null>(null)
-
-function toggleExportMenu(id: string) {
-  exportOpenId.value = exportOpenId.value === id ? null : id
-}
-
-// 文件名清洗:title 可能含路径分隔符/控制字符/emoji,只保留安全子集,空则降级 conv-id
-function sanitizeFilename(title: string | null | undefined, fallback: string): string {
-  const raw = (title || '').trim()
-  if (!raw) return fallback
-  // 替换 Windows/Unix 路径分隔符与非法字符为下划线,折叠连续空白
-  const cleaned = raw.replace(/[\\/:*?"<>|\r\n\t]+/g, '_').replace(/\s+/g, '_')
-  // 限长 60 防文件名过长;全被清成空(纯符号标题)→ fallback
-  return (cleaned.replace(/^_+|_+$/g, '').slice(0, 60)) || fallback
-}
-
-async function exportConversation(conv: AiConversationSummary, format: 'markdown' | 'json' | 'txt') {
-  exportOpenId.value = null
-  if (exportingId.value) return // 防重复点击
-  exportingId.value = conv.id
-  try {
-    const content = await aiApi.exportConversation(conv.id, format)
-    const ext = format === 'markdown' ? 'md' : format === 'json' ? 'json' : 'txt'
-    const mime = format === 'markdown' ? 'text/markdown;charset=utf-8'
-      : format === 'json' ? 'application/json;charset=utf-8'
-      : 'text/plain;charset=utf-8'
-    const base = sanitizeFilename(conv.title, conv.id)
-    const filename = `conversation-${base}.${ext}`
-    const blob = new Blob([content], { type: mime })
-    const url = URL.createObjectURL(blob)
-    const a = document.createElement('a')
-    a.href = url
-    a.download = filename
-    document.body.appendChild(a)
-    a.click()
-    document.body.removeChild(a)
-    // 释放对象 URL,避免 Blob 内存泄漏(下一轮事件循环已足够触发下载)
-    setTimeout(() => URL.revokeObjectURL(url), 0)
-  } catch (e: any) {
-    const msg = e?.message || String(e)
-    console.error('[AI] 导出对话失败:', e)
-    showToast(t('aiChat.exportFailed', { msg }), 'error')
-  } finally {
-    exportingId.value = null
-  }
-}
-
-// 点击外部关闭导出菜单(菜单展开时挂,关闭时摘;轻量,避免常驻 listener)
-function onExportOutsideClick(e: MouseEvent) {
-  if (!exportOpenId.value) return
-  const target = e.target as HTMLElement | null
-  if (target?.closest('.ai-conv-item-export')) return
-  exportOpenId.value = null
-}
+// 对话侧栏子组件引用(Ctrl+K 快捷键调 focusSearch;子组件自管重命名/导出/拖拽/搜索/分组)
+const convSidebarRef = ref<InstanceType<typeof ConversationSidebar> | null>(null)
 
 const activeProviderName = computed(() => {
   const active = store.state.providers.find(p => p.id === store.state.activeProvider)
@@ -1652,76 +1335,6 @@ function formatTokens(n: number): string {
   return n >= 1000 ? `${(n / 1000).toFixed(1)}k` : String(n)
 }
 
-/** 格式化时间戳（毫秒字符串 → 相对时间） */
-function formatTime(ts: string): string {
-  return formatRelativeZh(ts)
-}
-
-// ── 对话分组:今天 / 昨天 / 更早 (走 i18n,跟随语言切换) ──
-const BUCKET_LABELS = computed<Record<string, string>>(() => ({
-  today: t('aiChat.today'),
-  yesterday: t('aiChat.yesterday'),
-  earlier: t('aiChat.earlier'),
-}))
-
-/** 按日历日分桶(非 24h 滚动):today / yesterday / earlier */
-function timeBucket(ts: string): 'today' | 'yesterday' | 'earlier' {
-  const t = parseInt(ts, 10)
-  if (!Number.isFinite(t)) return 'earlier'
-  const d = new Date(t)
-  const now = new Date()
-  const sameDay = d.getFullYear() === now.getFullYear()
-    && d.getMonth() === now.getMonth()
-    && d.getDate() === now.getDate()
-  if (sameDay) return 'today'
-  const yest = new Date(now)
-  yest.setDate(now.getDate() - 1)
-  if (d.getFullYear() === yest.getFullYear()
-    && d.getMonth() === yest.getMonth()
-    && d.getDate() === yest.getDate()) return 'yesterday'
-  return 'earlier'
-}
-
-/** 活跃(非归档)对话按时间桶分组,保持后端 created_at DESC 顺序 */
-const groupedActive = computed(() => {
-  const map = new Map<string, AiConversationSummary[]>()
-  for (const c of store.state.conversations) {
-    if (c.archived) continue
-    const b = timeBucket(c.updated_at)
-    if (!map.has(b)) map.set(b, [])
-    map.get(b)!.push(c)
-  }
-  // 组内按 pinned DESC, updated_at DESC(置顶在前,同组最近更新的在前;UX-17)
-  for (const items of map.values()) {
-    items.sort((a, b) => Number(b.pinned ? 1 : 0) - Number(a.pinned ? 1 : 0)
-      || Number(b.updated_at) - Number(a.updated_at))
-  }
-  const groups: { key: string; label: string; items: AiConversationSummary[] }[] = []
-  for (const key of ['today', 'yesterday', 'earlier']) {
-    const items = map.get(key) || []
-    // 「今天」恒显(空则占位「暂无」);昨天/更早仅非空时出现
-    if (key === 'today' || items.length) groups.push({ key, label: BUCKET_LABELS.value[key], items })
-  }
-  return groups
-})
-
-/** 已归档对话(侧栏底部折叠展示;置顶在前,UX-17) */
-const archivedConvs = computed(() =>
-  store.state.conversations
-    .filter(c => c.archived)
-    .sort((a, b) => Number(b.pinned ? 1 : 0) - Number(a.pinned ? 1 : 0)
-      || Number(b.updated_at) - Number(a.updated_at)),
-)
-
-/**
- * UX-06 §3.1: 对话搜索结果(解包 store.filteredConversations 给模板用)。
- * useAiStore 返回普通对象(store.xxx 不经模板自动解包),本组件 computed 显式读 .value,
- * 模板直接用 searchResults。null=非搜索态(走原分组);数组=平铺结果(可能空)。
- */
-const searchResults = computed<AiConversationSummary[] | null>(
-  () => store.filteredConversations.value,
-)
-
 // ── 全局快捷键(window 级,非输入框内 handleKeydown) ──
 // 只绑不与浏览器/WebView2 默认冲突的键:
 // - Ctrl+L(浏览器聚焦地址栏——WebView2 内测,preventDefault 通常有效)
@@ -1745,7 +1358,8 @@ function onGlobalKeydown(e: KeyboardEvent) {
   if (ctrl && (e.key === 'k' || e.key === 'K')) {
     e.preventDefault()
     if (!store.state.sidebarOpen) store.toggleSidebar()
-    nextTick(() => searchInputRef.value?.focus())
+    // 经 ConversationSidebar expose 的 focusSearch 聚焦搜索框(等价原 searchInputRef.value?.focus())
+    nextTick(() => convSidebarRef.value?.focusSearch())
     return
   }
   // Ctrl+B: 切侧栏宽度/显隐(复用 store.toggleSidebar)
@@ -1795,30 +1409,6 @@ function onBeforeUnloadGuard(e: BeforeUnloadEvent) {
   e.returnValue = ''
 }
 
-// ── UX-2025-16: 侧栏宽度拖拽 ──
-// 生命周期:mousedown 时临时挂 document mousemove/mouseup,mouseup 时摘除(非常驻 onMounted)。
-// 对齐 onGlobalKeydown 的 listener 思路,但拖拽监听只活在拖拽期间。
-// 拖拽中 body cursor 锁 col-resize 防止 mousemove 跨元素时 cursor 抖动;user-select:none 防选中文本。
-const resizeState = { startX: 0, startWidth: 0 }
-function onResizeMove(e: MouseEvent) {
-  // delta>0 鼠标右移 → 侧栏变宽(右边缘向右扩)。clamp 由 setSidebarWidth 内部统一兜底
-  store.setSidebarWidth(resizeState.startWidth + (e.clientX - resizeState.startX))
-}
-function onResizeEnd() {
-  document.removeEventListener('mousemove', onResizeMove)
-  document.removeEventListener('mouseup', onResizeEnd)
-  document.body.classList.remove('ai-sidebar-resizing')
-  // mouseup 时一次性持久化(拖拽中高频 setSidebarWidth 只改 state 不落盘)
-  store.persistUiState()
-}
-function onResizeStart(e: MouseEvent) {
-  resizeState.startX = e.clientX
-  resizeState.startWidth = store.state.sidebarWidth
-  document.body.classList.add('ai-sidebar-resizing')
-  document.addEventListener('mousemove', onResizeMove)
-  document.addEventListener('mouseup', onResizeEnd)
-}
-
 function handleKeydown(e: KeyboardEvent) {
   // UX-09:编辑态 Escape 取消编辑(最高优先级)
   if (editingMsgId.value && e.key === 'Escape') {
@@ -2127,14 +1717,9 @@ onBeforeUnmount(() => {
   window.removeEventListener('keydown', onGlobalKeydown)
   // UX-260617-16:摘除未发送输入保护(分离窗口关闭/页面刷新触发 beforeunload)
   window.removeEventListener('beforeunload', onBeforeUnloadGuard)
-  // UX-18: 摘除导出菜单外部点击监听
-  document.removeEventListener('click', onExportOutsideClick)
+  // 注:导出菜单外部点击监听/侧栏拖拽 listener/标题淡入计时器现由 ConversationSidebar
+  // 子组件 onBeforeUnmount 自管(第一批抽离),父不再持有这些引用。
   if (rafId !== null) cancelAnimationFrame(rafId)
-  // UX-2025-16:防御性清理——组件在拖拽中途被卸载(分离窗口切换)时摘除临时 document listener,
-  // 否则 mousemove/mouseup 残留,下次进面板可能误触发。正常 mouseup 已自行摘除,这里兜底。
-  document.removeEventListener('mousemove', onResizeMove)
-  document.removeEventListener('mouseup', onResizeEnd)
-  document.body.classList.remove('ai-sidebar-resizing')
   // CR-260615-24: 释放后端 listener(ai-chat-event/ai-conversation-changed)+清流式看门狗。
   // 之前 stopListener 定义但全仓零调用 → listener+watchdog 永久泄漏;分离窗口主窗口 AiChat
   // 卸载(走 App.vue v-if detach)时 listener 仍挂后端,watchdog 130s 后写已卸载 state。
@@ -2144,8 +1729,6 @@ onBeforeUnmount(() => {
   if (_unlistenToolSlow) { _unlistenToolSlow(); _unlistenToolSlow = null } // B-260616-12
   if (_unlistenAutoApproved) { _unlistenAutoApproved(); _unlistenAutoApproved = null } // AE-2025-04
   if (_toastTimer) { clearTimeout(_toastTimer); _toastTimer = null }
-  // UX-2025-20:释放标题淡入计时器
-  if (_titleFlashTimer) { clearTimeout(_titleFlashTimer); _titleFlashTimer = null }
   // UX-2025-14:释放 provider 切换 bar 计时器
   if (_providerBarTimer) { clearTimeout(_providerBarTimer); _providerBarTimer = null }
 })
@@ -2220,8 +1803,7 @@ onMounted(async () => {
   // pendingSkill,经 beforeunload 拦截提示用户。注意:e.preventDefault() 才是现代浏览器
   // 触发原生「确定离开?」的标准做法 returnValue 仅 Chrome 兼容旧写法。
   window.addEventListener('beforeunload', onBeforeUnloadGuard)
-  // UX-18: 点击外部关闭导出格式菜单
-  document.addEventListener('click', onExportOutsideClick)
+  // 注:导出菜单外部点击监听现由 ConversationSidebar 子组件 onMounted 自管(第一批抽离)
   const t0 = (window as any).__APP_T0 ?? 0
   // 启动耗时埋点:debug 级(浏览器默认折叠不干扰,空白屏复现时可开 verbose 看)
   console.debug(`[启动] AiChat mounted: ${(performance.now() - t0).toFixed(0)}ms`)
diff --git a/src/components/ai/ConversationSidebar.vue b/src/components/ai/ConversationSidebar.vue
new file mode 100644
index 0000000..b5b2e1e
--- /dev/null
+++ b/src/components/ai/ConversationSidebar.vue
@@ -0,0 +1,457 @@
+<template>
+  <!-- ═══ 对话侧边栏(抽自 AiChat.vue 第一批,零行为变更) ═══ -->
+  <transition name="sidebar-slide">
+    <div
+      v-if="store.state.sidebarOpen"
+      class="ai-conv-sidebar"
+      :style="{ '--sidebar-width': store.state.sidebarWidth + 'px' }"
+    >
+      <!-- 侧栏右边缘拖拽条(UX-2025-16):col-resize,拖动 mousemove 改 sidebarWidth,mouseup 持久化 -->
+      <div
+        class="ai-sidebar-resize-handle"
+        :title="t('aiChat.sidebarResizeHint')"
+        @mousedown.prevent="onResizeStart"
+      />
+      <div class="ai-conv-sidebar-header">
+        <span class="ai-conv-sidebar-title">{{ t('aiChat.sidebarTitle') }}</span>
+        <button class="ai-btn-icon" @click="emit('confirm-new-conversation')" :title="t('aiChat.newConversation')">
+          <svg width="13" height="13" viewBox="0 0 24 24" fill="none" stroke="currentColor" stroke-width="1.8" stroke-linecap="round" stroke-linejoin="round"><line x1="12" y1="5" x2="12" y2="19"/><line x1="5" y1="12" x2="19" y2="12"/></svg>
+        </button>
+      </div>
+      <!-- UX-06 §3.1: 对话搜索框(v-model 双绑 store.searchQuery;Ctrl+K 聚焦) -->
+      <div class="ai-conv-search">
+        <svg class="ai-conv-search-icon" width="12" height="12" viewBox="0 0 24 24" fill="none" stroke="currentColor" stroke-width="2" stroke-linecap="round" stroke-linejoin="round"><circle cx="11" cy="11" r="8"/><line x1="21" y1="21" x2="16.65" y2="16.65"/></svg>
+        <input
+          ref="searchInputRef"
+          v-model="store.state.searchQuery"
+          class="ai-conv-search-input"
+          :placeholder="t('aiChat.searchPlaceholder')"
+          :title="t('aiChat.searchShortcutHint')"
+          type="text"
+        />
+        <kbd class="ai-conv-search-kbd">{{ t('aiChat.searchShortcutHint') }}</kbd>
+      </div>
+      <div class="ai-conv-list">
+        <!-- UX-06 §3.1: 搜索态(searchResults 非 null)→ 平铺,活跃+归档全量按 updated_at DESC -->
+        <template v-if="searchResults">
+          <div
+            v-for="conv in searchResults"
+            :key="'s-' + conv.id"
+            class="ai-conv-item"
+            :class="{
+              'ai-conv-item--active': conv.id === store.state.activeConversationId,
+              'ai-conv-item--archived': conv.archived,
+            }"
+            @click="onSelectSearchResult(conv.id)"
+          >
+            <div class="ai-conv-item-main">
+              <span class="ai-conv-item-title" :title="conv.title || ''">{{ conv.title || t('aiChat.newConversation') }}</span>
+              <span class="ai-conv-item-time">{{ formatTime(conv.updated_at) }}</span>
+            </div>
+            <div class="ai-conv-item-actions">
+              <button class="ai-conv-item-act" :class="{ 'ai-conv-item-act--pinned': conv.pinned }" @click.stop="store.setPinnedConversation(conv.id, !conv.pinned)" :title="conv.pinned ? t('aiChat.unpinConversation') : t('aiChat.pinConversation')">
+                <svg width="10" height="10" viewBox="0 0 24 24" :fill="conv.pinned ? 'currentColor' : 'none'" stroke="currentColor" stroke-width="2" stroke-linecap="round" stroke-linejoin="round"><path d="M12 17v5"/><path d="M9 10.76a2 2 0 01-1.11 1.79l-1.78.9A2 2 0 005 15.24V16a1 1 0 001 1h12a1 1 0 001-1v-.76a2 2 0 00-1.11-1.79l-1.78-.9A2 2 0 0115 10.76V7a1 1 0 011-1 2 2 0 002-2V3H6v1a2 2 0 002 2 1 1 0 011 1z"/></svg>
+              </button>
+              <button class="ai-conv-item-act" @click.stop="store.archiveConversation(conv.id, !conv.archived)" :title="conv.archived ? t('aiChat.unarchive') : t('aiChat.archive')">
+                <svg width="10" height="10" viewBox="0 0 24 24" fill="none" stroke="currentColor" stroke-width="2" stroke-linecap="round" stroke-linejoin="round"><rect x="2" y="4" width="20" height="5" rx="1"/><path d="M4 9v9a2 2 0 002 2h12a2 2 0 002-2V9"/><line x1="10" y1="13" x2="14" y2="13"/></svg>
+              </button>
+              <div class="ai-conv-item-export">
+                <button class="ai-conv-item-act" @click.stop="toggleExportMenu(conv.id)" :title="t('aiChat.exportConversation')" :disabled="exportingId === conv.id">
+                  <svg width="10" height="10" viewBox="0 0 24 24" fill="none" stroke="currentColor" stroke-width="2" stroke-linecap="round" stroke-linejoin="round"><path d="M21 15v4a2 2 0 01-2 2H5a2 2 0 01-2-2v-4"/><polyline points="7 10 12 15 17 10"/><line x1="12" y1="15" x2="12" y2="3"/></svg>
+                </button>
+                <div v-if="exportOpenId === conv.id" class="ai-conv-export-menu">
+                  <button class="ai-conv-export-opt" @click.stop="exportConversation(conv, 'markdown')">{{ t('aiChat.exportMarkdown') }}</button>
+                  <button class="ai-conv-export-opt" @click.stop="exportConversation(conv, 'json')">{{ t('aiChat.exportJson') }}</button>
+                  <button class="ai-conv-export-opt" @click.stop="exportConversation(conv, 'txt')">{{ t('aiChat.exportTxt') }}</button>
+                </div>
+              </div>
+              <button class="ai-conv-item-act" @click.stop="emit('confirm-delete', conv.id)" :title="t('common.delete')">
+                <svg width="10" height="10" viewBox="0 0 24 24" fill="none" stroke="currentColor" stroke-width="2" stroke-linecap="round" stroke-linejoin="round"><line x1="18" y1="6" x2="6" y2="18"/><line x1="6" y1="6" x2="18" y2="18"/></svg>
+              </button>
+            </div>
+          </div>
+          <div v-if="searchResults.length === 0" class="ai-conv-empty">
+            {{ t('aiChat.searchEmpty') }}
+          </div>
+        </template>
+
+        <!-- 非搜索态:原时间分组(活跃) + 归档分组 -->
+        <template v-else>
+          <!-- 活跃对话:按 今天/昨天/更早 分组 -->
+          <template v-for="group in groupedActive" :key="'g-' + group.key">
+            <div
+              class="ai-conv-group-title ai-conv-group-title--fold"
+              @click="store.toggleGroupFold(group.key)"
+            >
+              <span class="ai-conv-group-arrow" :class="{ 'is-folded': store.state.foldedGroups[group.key] }">▸</span>
+              {{ group.label }}
+              <span class="ai-conv-group-count">({{ group.items.length }})</span>
+            </div>
+            <div
+              v-if="group.key === 'today' && !group.items.length"
+              v-show="!store.state.foldedGroups[group.key]"
+              class="ai-conv-group-empty"
+            >{{ t('aiChat.groupEmpty') }}</div>
+            <div
+              v-for="conv in group.items"
+              v-show="!store.state.foldedGroups[group.key]"
+              :key="conv.id"
+              class="ai-conv-item"
+              :class="{ 'ai-conv-item--active': conv.id === store.state.activeConversationId }"
+              @click="store.switchConversation(conv.id)"
+            >
+              <div class="ai-conv-item-main">
+                <input
+                  v-if="editingConvId === conv.id"
+                  :ref="setEditEl"
+                  v-model="editText"
+                  class="ai-conv-item-edit"
+                  @keyup.enter="commitRename(conv.id)"
+                  @keyup.esc="cancelRename"
+                  @blur="commitRename(conv.id)"
+                  @click.stop
+                />
+                <span
+                  v-else
+                  class="ai-conv-item-title"
+                  :class="{ 'ai-conv-item-title--flash': titleFlash && conv.id === store.state.activeConversationId }"
+                  @dblclick.stop="startRename(conv)"
+                  :title="conv.title || t('aiChat.doubleClickToRename')"
+                >
+                  {{ conv.title || t('aiChat.newConversation') }}
+                  <!-- UX-2025-20 §7.4:AI 生成标题标识小图标(标题非空非占位时显示) -->
+                  <svg
+                    v-if="conv.title && titleFlash && conv.id === store.state.activeConversationId"
+                    class="ai-conv-item-title-badge"
+                    width="9" height="9" viewBox="0 0 24 24" fill="none" stroke="currentColor" stroke-width="2.5" stroke-linecap="round" stroke-linejoin="round"
+                  ><polyline points="20 6 9 17 4 12"/></svg>
+                </span>
+                <span class="ai-conv-item-time">{{ formatTime(conv.updated_at) }}</span>
+              </div>
+              <div class="ai-conv-item-actions">
+                <button class="ai-conv-item-act" :class="{ 'ai-conv-item-act--pinned': conv.pinned }" @click.stop="store.setPinnedConversation(conv.id, !conv.pinned)" :title="conv.pinned ? t('aiChat.unpinConversation') : t('aiChat.pinConversation')">
+                  <svg width="10" height="10" viewBox="0 0 24 24" :fill="conv.pinned ? 'currentColor' : 'none'" stroke="currentColor" stroke-width="2" stroke-linecap="round" stroke-linejoin="round"><path d="M12 17v5"/><path d="M9 10.76a2 2 0 01-1.11 1.79l-1.78.9A2 2 0 005 15.24V16a1 1 0 001 1h12a1 1 0 001-1v-.76a2 2 0 00-1.11-1.79l-1.78-.9A2 2 0 0115 10.76V7a1 1 0 011-1 2 2 0 002-2V3H6v1a2 2 0 002 2 1 1 0 011 1z"/></svg>
+                </button>
+                <button class="ai-conv-item-act" @click.stop="store.archiveConversation(conv.id, true)" :title="t('aiChat.archive')">
+                  <svg width="10" height="10" viewBox="0 0 24 24" fill="none" stroke="currentColor" stroke-width="2" stroke-linecap="round" stroke-linejoin="round"><rect x="2" y="4" width="20" height="5" rx="1"/><path d="M4 9v9a2 2 0 002 2h12a2 2 0 002-2V9"/><line x1="10" y1="13" x2="14" y2="13"/></svg>
+                </button>
+                <div class="ai-conv-item-export">
+                  <button class="ai-conv-item-act" @click.stop="toggleExportMenu(conv.id)" :title="t('aiChat.exportConversation')" :disabled="exportingId === conv.id">
+                    <svg width="10" height="10" viewBox="0 0 24 24" fill="none" stroke="currentColor" stroke-width="2" stroke-linecap="round" stroke-linejoin="round"><path d="M21 15v4a2 2 0 01-2 2H5a2 2 0 01-2-2v-4"/><polyline points="7 10 12 15 17 10"/><line x1="12" y1="15" x2="12" y2="3"/></svg>
+                  </button>
+                  <div v-if="exportOpenId === conv.id" class="ai-conv-export-menu">
+                    <button class="ai-conv-export-opt" @click.stop="exportConversation(conv, 'markdown')">{{ t('aiChat.exportMarkdown') }}</button>
+                    <button class="ai-conv-export-opt" @click.stop="exportConversation(conv, 'json')">{{ t('aiChat.exportJson') }}</button>
+                    <button class="ai-conv-export-opt" @click.stop="exportConversation(conv, 'txt')">{{ t('aiChat.exportTxt') }}</button>
+                  </div>
+                </div>
+                <button class="ai-conv-item-act" @click.stop="emit('confirm-delete', conv.id)" :title="t('common.delete')">
+                  <svg width="10" height="10" viewBox="0 0 24 24" fill="none" stroke="currentColor" stroke-width="2" stroke-linecap="round" stroke-linejoin="round"><line x1="18" y1="6" x2="6" y2="18"/><line x1="6" y1="6" x2="18" y2="18"/></svg>
+                </button>
+              </div>
+            </div>
+          </template>
+
+          <!-- 归档分组(可折叠) -->
+          <template v-if="archivedConvs.length">
+            <div class="ai-conv-group-title ai-conv-group-title--fold" @click="store.toggleArchivedFold()">
+              <span class="ai-conv-group-arrow" :class="{ 'is-folded': store.state.archivedCollapsed }">▸</span>
+              {{ t('aiChat.archivedCount', { n: archivedConvs.length }) }}
+            </div>
+            <div
+              v-for="conv in archivedConvs"
+              v-show="!store.state.archivedCollapsed"
+              :key="'a-' + conv.id"
+              class="ai-conv-item ai-conv-item--archived"
+              :class="{ 'ai-conv-item--active': conv.id === store.state.activeConversationId }"
+              @click="store.switchConversation(conv.id)"
+            >
+              <div class="ai-conv-item-main">
+                <span class="ai-conv-item-title" :title="conv.title || ''">{{ conv.title || t('aiChat.newConversation') }}</span>
+                <span class="ai-conv-item-time">{{ formatTime(conv.updated_at) }}</span>
+              </div>
+              <div class="ai-conv-item-actions">
+                <button class="ai-conv-item-act" :class="{ 'ai-conv-item-act--pinned': conv.pinned }" @click.stop="store.setPinnedConversation(conv.id, !conv.pinned)" :title="conv.pinned ? t('aiChat.unpinConversation') : t('aiChat.pinConversation')">
+                  <svg width="10" height="10" viewBox="0 0 24 24" :fill="conv.pinned ? 'currentColor' : 'none'" stroke="currentColor" stroke-width="2" stroke-linecap="round" stroke-linejoin="round"><path d="M12 17v5"/><path d="M9 10.76a2 2 0 01-1.11 1.79l-1.78.9A2 2 0 005 15.24V16a1 1 0 001 1h12a1 1 0 001-1v-.76a2 2 0 00-1.11-1.79l-1.78-.9A2 2 0 0115 10.76V7a1 1 0 011-1 2 2 0 002-2V3H6v1a2 2 0 002 2 1 1 0 011 1z"/></svg>
+                </button>
+                <button class="ai-conv-item-act" @click.stop="store.archiveConversation(conv.id, false)" :title="t('aiChat.unarchive')">
+                  <svg width="10" height="10" viewBox="0 0 24 24" fill="none" stroke="currentColor" stroke-width="2" stroke-linecap="round" stroke-linejoin="round"><rect x="2" y="4" width="20" height="5" rx="1"/><path d="M4 9v9a2 2 0 002 2h12a2 2 0 002-2V9"/><line x1="12" y1="13" x2="12" y2="17"/><polyline points="10 15 12 13 14 15"/></svg>
+                </button>
+                <div class="ai-conv-item-export">
+                  <button class="ai-conv-item-act" @click.stop="toggleExportMenu(conv.id)" :title="t('aiChat.exportConversation')" :disabled="exportingId === conv.id">
+                    <svg width="10" height="10" viewBox="0 0 24 24" fill="none" stroke="currentColor" stroke-width="2" stroke-linecap="round" stroke-linejoin="round"><path d="M21 15v4a2 2 0 01-2 2H5a2 2 0 01-2-2v-4"/><polyline points="7 10 12 15 17 10"/><line x1="12" y1="15" x2="12" y2="3"/></svg>
+                  </button>
+                  <div v-if="exportOpenId === conv.id" class="ai-conv-export-menu">
+                    <button class="ai-conv-export-opt" @click.stop="exportConversation(conv, 'markdown')">{{ t('aiChat.exportMarkdown') }}</button>
+                    <button class="ai-conv-export-opt" @click.stop="exportConversation(conv, 'json')">{{ t('aiChat.exportJson') }}</button>
+                    <button class="ai-conv-export-opt" @click.stop="exportConversation(conv, 'txt')">{{ t('aiChat.exportTxt') }}</button>
+                  </div>
+                </div>
+                <button class="ai-conv-item-act" @click.stop="emit('confirm-delete', conv.id)" :title="t('common.delete')">
+                  <svg width="10" height="10" viewBox="0 0 24 24" fill="none" stroke="currentColor" stroke-width="2" stroke-linecap="round" stroke-linejoin="round"><line x1="18" y1="6" x2="6" y2="18"/><line x1="6" y1="6" x2="18" y2="18"/></svg>
+                </button>
+              </div>
+            </div>
+          </template>
+
+          <div v-if="store.state.conversations.length === 0" class="ai-conv-empty">
+            {{ t('aiChat.emptyConversation') }}
+          </div>
+        </template>
+      </div>
+    </div>
+  </transition>
+</template>
+
+<script setup lang="ts">
+/**
+ * 对话侧边栏 — 抽自 AiChat.vue 第一批重构(零行为变更)。
+ *
+ * 设计:
+ * - store 共享(useAiStore 全局单例),子组件直接 useAiStore 读写 store.state/mutations,
+ *   与父组件 AiChat 等价(策略:store 共享则两边都用 useXxxStore,不走 props 传 store)。
+ * - 跨组件事件走 emit:
+ *   - `confirm-delete`(id):删除需弹 ConfirmDialog,而 ConfirmDialog 由父渲染 +
+ *     confirmDialog 实例归父所有(useConfirm 每次调用返回独立 ref,非全局单例),
+ *     故删除确认交父处理。父调原 confirmDeleteConversation(id)。
+ *   - `confirm-new-conversation`:新建对话(生成中走确认弹层),交父 confirmNewConversation。
+ *   - `export-error`(msg):导出失败 toast,父 showToast(分离窗口自管 toast)。
+ * - 父 Ctrl+K 全局快捷键聚焦搜索框:经 defineExpose({ focusSearch }) 供父调,
+ *   父侧 ref 替代原 searchInputRef(零行为变更)。
+ *
+ * 本组件自管的纯侧栏态:titleFlash/重命名/导出菜单/侧栏拖拽/搜索结果/时间分组。
+ * 样式:零 scoped style(沿用 AiChat.vue 全局/父级样式,样式后续批下沉)。
+ */
+import { ref, computed, nextTick, watch, onMounted, onBeforeUnmount } from 'vue'
+import { useI18n } from 'vue-i18n'
+import { useAiStore } from '../../stores/ai'
+import { aiApi } from '../../api'
+import { formatRelativeZh } from '../../utils/time'
+import type { AiConversationSummary } from '../../api/types'
+
+const emit = defineEmits<{
+  /** 删除对话(需二次确认),父调 confirmDeleteConversation(id) */
+  (e: 'confirm-delete', id: string): void
+  /** 新建对话(生成中需二次确认),父调 confirmNewConversation() */
+  (e: 'confirm-new-conversation'): void
+  /** 导出失败,父 showToast(msg, 'error') */
+  (e: 'export-error', msg: string): void
+}>()
+
+const { t } = useI18n()
+const store = useAiStore()
+
+// ── 标题生成淡入(UX-2025-20 §7.4):监听当前对话标题从空→非空触发 ──
+const titleFlash = ref(false)
+let _titleFlashTimer: ReturnType<typeof setTimeout> | null = null
+const activeConv = computed(() =>
+  store.state.conversations.find(c => c.id === store.state.activeConversationId) || null,
+)
+watch(
+  () => activeConv.value?.title,
+  (newTitle, oldTitle) => {
+    if (!newTitle) return
+    if (oldTitle && oldTitle === newTitle) return
+    if (oldTitle) return
+    titleFlash.value = true
+    if (_titleFlashTimer) clearTimeout(_titleFlashTimer)
+    _titleFlashTimer = setTimeout(() => { titleFlash.value = false }, 320)
+  },
+)
+
+// ── 对话项 inline 重命名 ──
+const editingConvId = ref<string | null>(null)
+const editText = ref('')
+let editEl: HTMLInputElement | null = null
+function setEditEl(el: Element | { $el?: Element } | null): void {
+  editEl = (el as HTMLInputElement) || null
+}
+
+// UX-06 §3.1: 对话搜索框引用(Ctrl+K 聚焦用)
+const searchInputRef = ref<HTMLInputElement>()
+
+/** 父 Ctrl+K 快捷键调用:聚焦搜索框(等价原 searchInputRef.value?.focus()) */
+function focusSearch(): void {
+  nextTick(() => searchInputRef.value?.focus())
+}
+
+function startRename(conv: { id: string; title: string | null }) {
+  editingConvId.value = conv.id
+  editText.value = conv.title || ''
+  nextTick(() => {
+    editEl?.focus()
+    editEl?.select()
+  })
+}
+
+async function commitRename(id: string) {
+  const title = editText.value.trim()
+  if (title && editingConvId.value === id) {
+    await store.renameConversation(id, title)
+  }
+  editingConvId.value = null
+}
+
+function cancelRename() {
+  editingConvId.value = null
+}
+
+// ── UX-18: 对话导出 ──
+const exportOpenId = ref<string | null>(null)
+const exportingId = ref<string | null>(null)
+
+function toggleExportMenu(id: string) {
+  exportOpenId.value = exportOpenId.value === id ? null : id
+}
+
+function sanitizeFilename(title: string | null | undefined, fallback: string): string {
+  const raw = (title || '').trim()
+  if (!raw) return fallback
+  const cleaned = raw.replace(/[\\/:*?"<>|\r\n\t]+/g, '_').replace(/\s+/g, '_')
+  return (cleaned.replace(/^_+|_+$/g, '').slice(0, 60)) || fallback
+}
+
+async function exportConversation(conv: AiConversationSummary, format: 'markdown' | 'json' | 'txt') {
+  exportOpenId.value = null
+  if (exportingId.value) return
+  exportingId.value = conv.id
+  try {
+    const content = await aiApi.exportConversation(conv.id, format)
+    const ext = format === 'markdown' ? 'md' : format === 'json' ? 'json' : 'txt'
+    const mime = format === 'markdown' ? 'text/markdown;charset=utf-8'
+      : format === 'json' ? 'application/json;charset=utf-8'
+      : 'text/plain;charset=utf-8'
+    const base = sanitizeFilename(conv.title, conv.id)
+    const filename = `conversation-${base}.${ext}`
+    const blob = new Blob([content], { type: mime })
+    const url = URL.createObjectURL(blob)
+    const a = document.createElement('a')
+    a.href = url
+    a.download = filename
+    document.body.appendChild(a)
+    a.click()
+    document.body.removeChild(a)
+    setTimeout(() => URL.revokeObjectURL(url), 0)
+  } catch (e: any) {
+    const msg = e?.message || String(e)
+    console.error('[AI] 导出对话失败:', e)
+    emit('export-error', t('aiChat.exportFailed', { msg }))
+  } finally {
+    exportingId.value = null
+  }
+}
+
+// 点击外部关闭导出菜单
+function onExportOutsideClick(e: MouseEvent) {
+  if (!exportOpenId.value) return
+  const target = e.target as HTMLElement | null
+  if (target?.closest('.ai-conv-item-export')) return
+  exportOpenId.value = null
+}
+
+/**
+ * UX-260617-23:搜索结果点击切对话后清空 searchQuery,退出搜索模式回原时间分组视图。
+ */
+function onSelectSearchResult(id: string) {
+  void store.switchConversation(id)
+  store.state.searchQuery = ''
+}
+
+function formatTime(ts: string): string {
+  return formatRelativeZh(ts)
+}
+
+// ── 对话分组:今天 / 昨天 / 更早 ──
+const BUCKET_LABELS = computed<Record<string, string>>(() => ({
+  today: t('aiChat.today'),
+  yesterday: t('aiChat.yesterday'),
+  earlier: t('aiChat.earlier'),
+}))
+
+function timeBucket(ts: string): 'today' | 'yesterday' | 'earlier' {
+  const t = parseInt(ts, 10)
+  if (!Number.isFinite(t)) return 'earlier'
+  const d = new Date(t)
+  const now = new Date()
+  const sameDay = d.getFullYear() === now.getFullYear()
+    && d.getMonth() === now.getMonth()
+    && d.getDate() === now.getDate()
+  if (sameDay) return 'today'
+  const yest = new Date(now)
+  yest.setDate(now.getDate() - 1)
+  if (d.getFullYear() === yest.getFullYear()
+    && d.getMonth() === yest.getMonth()
+    && d.getDate() === yest.getDate()) return 'yesterday'
+  return 'earlier'
+}
+
+const groupedActive = computed(() => {
+  const map = new Map<string, AiConversationSummary[]>()
+  for (const c of store.state.conversations) {
+    if (c.archived) continue
+    const b = timeBucket(c.updated_at)
+    if (!map.has(b)) map.set(b, [])
+    map.get(b)!.push(c)
+  }
+  for (const items of map.values()) {
+    items.sort((a, b) => Number(b.pinned ? 1 : 0) - Number(a.pinned ? 1 : 0)
+      || Number(b.updated_at) - Number(a.updated_at))
+  }
+  const groups: { key: string; label: string; items: AiConversationSummary[] }[] = []
+  for (const key of ['today', 'yesterday', 'earlier']) {
+    const items = map.get(key) || []
+    if (key === 'today' || items.length) groups.push({ key, label: BUCKET_LABELS.value[key], items })
+  }
+  return groups
+})
+
+const archivedConvs = computed(() =>
+  store.state.conversations
+    .filter(c => c.archived)
+    .sort((a, b) => Number(b.pinned ? 1 : 0) - Number(a.pinned ? 1 : 0)
+      || Number(b.updated_at) - Number(a.updated_at)),
+)
+
+const searchResults = computed<AiConversationSummary[] | null>(
+  () => store.filteredConversations.value,
+)
+
+// ── UX-2025-16: 侧栏宽度拖拽 ──
+const resizeState = { startX: 0, startWidth: 0 }
+function onResizeMove(e: MouseEvent) {
+  store.setSidebarWidth(resizeState.startWidth + (e.clientX - resizeState.startX))
+}
+function onResizeEnd() {
+  document.removeEventListener('mousemove', onResizeMove)
+  document.removeEventListener('mouseup', onResizeEnd)
+  document.body.classList.remove('ai-sidebar-resizing')
+  store.persistUiState()
+}
+function onResizeStart(e: MouseEvent) {
+  resizeState.startX = e.clientX
+  resizeState.startWidth = store.state.sidebarWidth
+  document.body.classList.add('ai-sidebar-resizing')
+  document.addEventListener('mousemove', onResizeMove)
+  document.addEventListener('mouseup', onResizeEnd)
+}
+
+onMounted(() => {
+  // UX-18: 点击外部关闭导出格式菜单(原 AiChat onMounted 同段迁移)
+  document.addEventListener('click', onExportOutsideClick)
+})
+
+onBeforeUnmount(() => {
+  document.removeEventListener('click', onExportOutsideClick)
+  // UX-2025-16:拖拽中途卸载兜底摘临时 document listener(原 AiChat 同段迁移)
+  document.removeEventListener('mousemove', onResizeMove)
+  document.removeEventListener('mouseup', onResizeEnd)
+  document.body.classList.remove('ai-sidebar-resizing')
+  // UX-2025-20:释放标题淡入计时器
+  if (_titleFlashTimer) { clearTimeout(_titleFlashTimer); _titleFlashTimer = null }
+})
+
+defineExpose({
+  /** 聚焦搜索框(父 Ctrl+K 快捷键调,等价原 searchInputRef.value?.focus()) */
+  focusSearch,
+})
+</script>