feat(miniapp): improve session navigation and auth guard

miniapp/pages/chat/index.js

@@ -2,9 +2,14 @@ const {
   checkAuth,
   createAgentRun,
   getAgentRun,
-  loadSession
+  loadSession,
+  logout
 } = require('../../utils/api');
-const { AGENT_RUN_MAX_POLLS, AGENT_RUN_POLL_MS } = require('../../utils/config');
+const {
+  AGENT_RUN_MAX_POLLS,
+  AGENT_RUN_POLL_MS,
+  SELECTED_SESSION_KEY
+} = require('../../utils/config');
 const { createUserMessage, normalizeMessages } = require('../../utils/messages');
 
 function delay(ms) {
@@ -17,6 +22,7 @@ Page({
     messages: [],
     draft: '',
     loading: false,
+    error: '',
     scrollIntoView: ''
   },
 
@@ -25,6 +31,14 @@ Page({
       const status = await checkAuth();
       if (!status?.authenticated) {
         wx.redirectTo({ url: '/pages/login/index' });
+        return;
+      }
+      const selectedSessionId = wx.getStorageSync(SELECTED_SESSION_KEY);
+      if (selectedSessionId) {
+        wx.removeStorageSync(SELECTED_SESSION_KEY);
+        if (selectedSessionId !== this.data.sessionId) {
+          await this.openSession(selectedSessionId);
+        }
       }
     } catch {
       wx.redirectTo({ url: '/pages/login/index' });
@@ -49,7 +63,7 @@ Page({
       ...this.data.messages,
       { id: userMessage.id, role: 'user', text }
     ];
-    this.setData({ messages: nextMessages, draft: '', loading: true });
+    this.setData({ messages: nextMessages, draft: '', loading: true, error: '' });
     this.scrollToBottom();
 
     try {
@@ -61,6 +75,7 @@ Page({
       const run = await createAgentRun(payload);
       await this.waitForRun(run?.id || run?.runId);
     } catch (error) {
+      this.setData({ error: error?.message || '发送失败' });
       wx.showToast({ title: error?.message || '发送失败', icon: 'none' });
     } finally {
       this.setData({ loading: false });
@@ -92,6 +107,35 @@ Page({
   async refreshSession(sessionId) {
     const detail = await loadSession(sessionId);
     const messages = normalizeMessages(detail?.messages || detail?.data?.messages || []);
-    this.setData({ messages });
+    this.setData({ sessionId, messages, error: '' });
+  },
+
+  async openSession(sessionId) {
+    this.setData({ loading: true, error: '' });
+    try {
+      await this.refreshSession(sessionId);
+    } catch (error) {
+      this.setData({ error: error?.message || '会话加载失败' });
+    } finally {
+      this.setData({ loading: false });
+      this.scrollToBottom();
+    }
+  },
+
+  startNewChat() {
+    wx.removeStorageSync(SELECTED_SESSION_KEY);
+    this.setData({ sessionId: '', messages: [], draft: '', error: '' });
+  },
+
+  async handleLogout() {
+    this.setData({ loading: true, error: '' });
+    try {
+      await logout();
+      wx.redirectTo({ url: '/pages/login/index' });
+    } catch (error) {
+      this.setData({ error: error?.message || '退出失败' });
+    } finally {
+      this.setData({ loading: false });
+    }
   }
 });

miniapp/pages/chat/index.wxml

@@ -1,5 +1,19 @@
 <view class="page chat-page">
+  <view class="chat-header">
+    <view class="chat-title">
+      <text>{{sessionId ? '继续会话' : '新会话'}}</text>
+      <text wx:if="{{error}}" class="header-error">{{error}}</text>
+    </view>
+    <view class="header-actions">
+      <button class="header-button" bindtap="startNewChat">新聊天</button>
+      <button class="header-button" bindtap="handleLogout">退出</button>
+    </view>
+  </view>
+
   <scroll-view class="messages" scroll-y scroll-into-view="{{scrollIntoView}}">
+    <view wx:if="{{messages.length === 0 && !loading}}" class="empty-state">
+      <text>发一条消息开始使用 TKMind。</text>
+    </view>
     <view wx:for="{{messages}}" wx:key="id" id="msg-{{index}}" class="message {{item.role}}">
       <text>{{item.text}}</text>
     </view>

miniapp/pages/chat/index.wxss

@@ -5,12 +5,63 @@
   padding: 0;
 }
 
+.chat-header {
+  display: flex;
+  align-items: center;
+  justify-content: space-between;
+  gap: 16rpx;
+  padding: 20rpx 24rpx;
+  background: #ffffff;
+  border-bottom: 1rpx solid #dbe3eb;
+}
+
+.chat-title {
+  display: flex;
+  flex-direction: column;
+  gap: 4rpx;
+  min-width: 0;
+  font-size: 30rpx;
+  font-weight: 800;
+}
+
+.header-error {
+  max-width: 420rpx;
+  color: #b42318;
+  font-size: 22rpx;
+  font-weight: 500;
+  overflow: hidden;
+  text-overflow: ellipsis;
+  white-space: nowrap;
+}
+
+.header-actions {
+  display: flex;
+  gap: 12rpx;
+}
+
+.header-button {
+  width: 112rpx;
+  height: 58rpx;
+  line-height: 58rpx;
+  border-radius: 10rpx;
+  background: #eef6f5;
+  color: #0f766e;
+  font-size: 24rpx;
+}
+
 .messages {
   flex: 1;
   box-sizing: border-box;
   padding: 28rpx;
 }
 
+.empty-state {
+  margin: 160rpx auto 0;
+  color: #64748b;
+  font-size: 28rpx;
+  text-align: center;
+}
+
 .message {
   max-width: 84%;
   margin-bottom: 20rpx;

miniapp/pages/login/index.js

@@ -1,4 +1,5 @@
 const {
+  checkAuth,
   loginWithPassword,
   loginWithWechatCode
 } = require('../../utils/api');
@@ -13,6 +14,17 @@ Page({
     passwordLoading: false
   },
 
+  async onLoad() {
+    try {
+      const status = await checkAuth();
+      if (status?.authenticated) {
+        wx.switchTab({ url: '/pages/chat/index' });
+      }
+    } catch {
+      // Stay on the login page when the existing session cannot be verified.
+    }
+  },
+
   handleUsername(event) {
     this.setData({ username: event.detail.value, error: '' });
   },

miniapp/pages/sessions/index.js

@@ -1,4 +1,5 @@
-const { listSessions } = require('../../utils/api');
+const { checkAuth, listSessions } = require('../../utils/api');
+const { SELECTED_SESSION_KEY } = require('../../utils/config');
 
 function formatTime(value) {
   const timestamp = Number(value || 0);
@@ -15,7 +16,20 @@ Page({
   },
 
   onShow() {
-    this.loadSessions();
+    this.ensureAndLoad();
+  },
+
+  async ensureAndLoad() {
+    try {
+      const status = await checkAuth();
+      if (!status?.authenticated) {
+        wx.redirectTo({ url: '/pages/login/index' });
+        return;
+      }
+      await this.loadSessions();
+    } catch {
+      wx.redirectTo({ url: '/pages/login/index' });
+    }
   },
 
   async loadSessions() {
@@ -40,6 +54,7 @@ Page({
   openSession(event) {
     const id = event.currentTarget.dataset.id;
     if (!id) return;
+    wx.setStorageSync(SELECTED_SESSION_KEY, id);
     wx.switchTab({ url: '/pages/chat/index' });
   }
 });

miniapp/pages/space/index.js

@@ -1,4 +1,4 @@
-const { listMindSpacePages } = require('../../utils/api');
+const { checkAuth, listMindSpacePages } = require('../../utils/api');
 
 Page({
   data: {
@@ -8,7 +8,20 @@ Page({
   },
 
   onShow() {
-    this.loadPages();
+    this.ensureAndLoad();
+  },
+
+  async ensureAndLoad() {
+    try {
+      const status = await checkAuth();
+      if (!status?.authenticated) {
+        wx.redirectTo({ url: '/pages/login/index' });
+        return;
+      }
+      await this.loadPages();
+    } catch {
+      wx.redirectTo({ url: '/pages/login/index' });
+    }
   },
 
   async loadPages() {

miniapp/utils/config.js

@@ -1,6 +1,7 @@
 module.exports = {
   API_BASE_URL: 'https://h5.tkmind.cn',
   MINIAPP_LOGIN_PATH: '/auth/wechat-miniapp/login',
+  SELECTED_SESSION_KEY: 'tkmind_selected_session_id',
   AGENT_RUN_POLL_MS: 1200,
   AGENT_RUN_MAX_POLLS: 120
 };