fix(miniapp): persist session token for WeChat login

Return sessionToken from login endpoints and store it client-side because
wx.request cannot rely on Set-Cookie. Also fix multi-cookie parsing,
start on login page, and guard chat rendering fields.

Co-authored-by: Cursor <cursoragent@cursor.com>

miniapp/pages/chat/index.js

@@ -30,10 +30,30 @@ Page({
   },
 
   async onShow() {
+    if (this._authCheckPromise) {
+      await this._authCheckPromise;
+      return;
+    }
+    this._authCheckPromise = this.verifyAccess();
+    try {
+      await this._authCheckPromise;
+    } finally {
+      this._authCheckPromise = null;
+    }
+  },
+
+  async verifyAccess() {
+    if (this._redirectingToLogin) return;
     try {
       const status = await checkAuth();
       if (!status?.authenticated) {
-        wx.redirectTo({ url: '/pages/login/index' });
+        this._redirectingToLogin = true;
+        wx.redirectTo({
+          url: '/pages/login/index',
+          complete: () => {
+            this._redirectingToLogin = false;
+          },
+        });
         return;
       }
       await this.ensureCurrentUser();
@@ -47,7 +67,14 @@ Page({
         await this.refreshSession(this.data.sessionId);
       }
     } catch {
-      wx.redirectTo({ url: '/pages/login/index' });
+      if (this._redirectingToLogin) return;
+      this._redirectingToLogin = true;
+      wx.redirectTo({
+        url: '/pages/login/index',
+        complete: () => {
+          this._redirectingToLogin = false;
+        },
+      });
     }
   },
 

miniapp/pages/chat/index.wxml

@@ -17,7 +17,7 @@
     <view wx:for="{{messages}}" wx:key="id" id="msg-{{index}}" class="message-row {{item.role}}">
       <view class="message {{item.role}}">
         <view class="message-body">
-          <block wx:for="{{item.parts}}" wx:for-item="part" wx:for-index="partIndex" wx:key="partIndex">
+          <block wx:for="{{item.parts || []}}" wx:for-item="part" wx:for-index="partIndex" wx:key="partIndex">
             <text wx:if="{{part.type === 'text'}}" class="message-text">{{part.text}}</text>
             <text
               wx:elif="{{part.type === 'link'}}"
@@ -27,7 +27,7 @@
             >{{part.text}}</text>
           </block>
         </view>
-        <view wx:if="{{item.pageLinks.length}}" class="page-links">
+        <view wx:if="{{item.pageLinks && item.pageLinks.length}}" class="page-links">
           <view
             wx:for="{{item.pageLinks}}"
             wx:for-item="page"

miniapp/pages/login/index.js

@@ -43,6 +43,10 @@ Page({
     try {
       const status = await checkAuth();
       if (status?.authenticated) {
+        const app = getApp();
+        if (status.user) {
+          app.globalData.user = status.user;
+        }
         wx.switchTab({ url: '/pages/chat/index' });
       }
     } catch {