fix(frontend): restore conversation delete animation

Use a two-phase delete flow for conversation list items.

Instead of immediately removing the deleted conversation from the array and relying only on transition-group leave hooks, mark the target conversation as pending deletion first so it can play the left-slide animation, then remove it after the animation completes.

Also keep the list container mounted during delete mode so empty/loading branches do not interrupt the exit transition.

Validation: npm run build --silent 2>&1 | tail -n 20

static/src/app/computed.ts

@@ -58,6 +58,7 @@ export const computed = {
     'searchResults',
     'conversationInsertAnimations',
     'conversationListAnimationMode',
+    'pendingDeletingConversationIds',
     'searchActive',
     'searchInProgress',
     'searchMoreAvailable',

static/src/app/methods/conversation.ts

@@ -631,17 +631,31 @@ export const conversationMethods = {
           history.replaceState({}, '', '/new');
         }
 
-        // 先从本地列表移除，让侧边栏执行删除动画；随后再刷新服务端列表补齐分页状态
+        // 先给目标项加 deleting 类执行左滑动画，再从本地列表移除。
+        // 这比完全依赖 transition-group leave 更稳定：即使列表即将为空或分支切换，也能先播放离场动画。
         this.conversationListAnimationMode = 'delete';
+        const deletingIds = Array.isArray(this.pendingDeletingConversationIds)
+          ? this.pendingDeletingConversationIds
+          : [];
+        if (!deletingIds.includes(conversationId)) {
+          this.pendingDeletingConversationIds = [...deletingIds, conversationId];
+        }
+        await this.$nextTick();
+        await waitForAnimation(430);
+
         this.conversations = this.conversations.filter(
           (conversation) => conversation.id !== conversationId
         );
         this.searchResults = this.searchResults.filter(
           (conversation) => conversation.id !== conversationId
         );
+        this.pendingDeletingConversationIds = (Array.isArray(this.pendingDeletingConversationIds)
+          ? this.pendingDeletingConversationIds
+          : []
+        ).filter((id) => id !== conversationId);
 
         // 等待“左滑离场 + 0.1s 后集体上移”动画结束，避免刷新列表打断过渡。
-        await waitForAnimation(560);
+        await waitForAnimation(180);
 
         // 刷新对话列表
         this.conversationsOffset = 0;
@@ -656,6 +670,11 @@ export const conversationMethods = {
         });
       }
     } catch (error) {
+      this.pendingDeletingConversationIds = (Array.isArray(this.pendingDeletingConversationIds)
+        ? this.pendingDeletingConversationIds
+        : []
+      ).filter((id) => id !== conversationId);
+      this.conversationListAnimationMode = 'idle';
       console.error('删除对话异常:', error);
       this.uiPushToast({
         title: '删除对话异常',

static/src/components/sidebar/ConversationSidebar.vue

@@ -129,12 +129,12 @@
           </button>
         </div>
         <div
-          v-if="loading && !displayConversations.length && !searchActive"
+          v-if="loading && !displayConversations.length && !searchActive && !isDeletingConversation"
           class="loading-conversations"
         >
           正在加载...
         </div>
-        <div v-else-if="!displayConversations.length && !loading" class="no-conversations">
+        <div v-else-if="!displayConversations.length && !loading && !isDeletingConversation" class="no-conversations">
           {{ searchActive ? '未找到匹配对话' : '暂无对话记录' }}
         </div>
         <transition-group
@@ -153,7 +153,8 @@
               running: isConversationActive(conv.id) || isConversationCompleted(conv.id),
               'insert-from-left': conversationInsertAnimations[conv.id] === 'create',
               'insert-from-under': conversationInsertAnimations[conv.id] === 'duplicate',
-              'duplicate-source-mask': conversationInsertAnimations[conv.id] === 'duplicateSource'
+              'duplicate-source-mask': conversationInsertAnimations[conv.id] === 'duplicateSource',
+              deleting: pendingDeletingConversationIds.includes(conv.id)
             }"
             @click="
               openActionMenuId = null;
@@ -338,6 +339,7 @@ const {
   conversations,
   conversationInsertAnimations,
   conversationListAnimationMode,
+  pendingDeletingConversationIds,
   conversationsLoading,
   hasMoreConversations: hasMore,
   loadingMoreConversations: loadingMore,
@@ -375,6 +377,7 @@ const displayConversations = computed(() =>
 const loading = computed(() =>
   searchActive.value ? searchInProgress.value : conversationsLoading.value
 );
+const isDeletingConversation = computed(() => conversationListAnimationMode.value === 'delete');
 const runningTaskItems = computed(() =>
   Array.isArray(props.runningTasks)
     ? props.runningTasks.filter(

static/src/stores/conversation.ts

@@ -13,6 +13,7 @@ interface ConversationState {
   searchResults: ConversationSummary[];
   conversationInsertAnimations: Record<string, 'create' | 'duplicate' | 'duplicateSource'>;
   conversationListAnimationMode: 'idle' | 'create' | 'duplicate' | 'delete';
+  pendingDeletingConversationIds: string[];
   conversationsLoading: boolean;
   hasMoreConversations: boolean;
   loadingMoreConversations: boolean;
@@ -37,6 +38,7 @@ export const useConversationStore = defineStore('conversation', {
     searchResults: [],
     conversationInsertAnimations: {},
     conversationListAnimationMode: 'idle',
+    pendingDeletingConversationIds: [],
     conversationsLoading: false,
     hasMoreConversations: false,
     loadingMoreConversations: false,
@@ -60,6 +62,7 @@ export const useConversationStore = defineStore('conversation', {
       this.searchResults = [];
       this.conversationInsertAnimations = {};
       this.conversationListAnimationMode = 'idle';
+      this.pendingDeletingConversationIds = [];
       this.searchActive = false;
       this.searchInProgress = false;
       this.searchMoreAvailable = false;

static/src/styles/components/sidebar/_conversation.scss

@@ -394,6 +394,15 @@ body[data-theme='dark']
   opacity: 0;
 }
 
+.conversation-sidebar .conversation-item.deleting {
+  transform: translateX(-112%);
+  opacity: 0;
+  pointer-events: none;
+  transition:
+    transform 420ms cubic-bezier(0.32, 0, 0.67, 0),
+    opacity 260ms ease;
+}
+
 .conversation-sidebar .conversation-item:hover,
 .conversation-sidebar .conversation-item:focus-within,
 .conversation-sidebar .conversation-item.active:hover,