优化新建会话逻辑

pages/Chat/Chat.vue

@@ -725,7 +725,10 @@ import { openFile as openFileNative, downloadAndOpen } from '@/utils/fileOpener.
 				return
 			}
 			closeNewChatModal();
-			takeUserConversations();
+			await takeUserConversations();
+			// 切换到新创建的会话
+			currentSessionId.value = conversationId;
+			uni.setStorageSync('currentSessionId', conversationId);
 
 		} catch (error) {
 			// ❌ 统一捕获异步错误，防止崩溃
@@ -785,8 +788,9 @@ import { openFile as openFileNative, downloadAndOpen } from '@/utils/fileOpener.
 			}
 			// 刷新会话列表
 			await takeUserConversations()
-			// 切换到新创建的会话
+			// 切换到新创建的会话并持久化
 			currentSessionId.value = result.conversation_id
+			uni.setStorageSync('currentSessionId', result.conversation_id)
 			uni.hideLoading()
 			uni.showToast({ title: `已创建「${result.title || agent.title}」会话`, icon: 'success' })
 		} catch (error) {