fix: remove fullChat local state, use activeChat directly to prevent desync

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

frontend/src/pages/MainLayout.tsx

@@ -1,7 +1,6 @@
 import { useState, useEffect } from 'react';
 import { Search, Edit, Settings, Shield, Wifi, WifiOff, MessageCircle } from 'lucide-react';
 import { useStore } from '../store';
-import { useNavigate } from 'react-router-dom';
 import { wsClient } from '../api/ws';
 import api from '../api/client';
 import Avatar from '../components/Avatar';
@@ -17,7 +16,6 @@ import { Chat } from '../types';
 
 export default function MainLayout() {
   const { user, chats, activeChat, setActiveChat, connected, onlineUsers, updateChat, setChats } = useStore();
-  const navigate = useNavigate();
   const [search, setSearch] = useState('');
   const [searchUsers, setSearchUsers] = useState<any[]>([]);
   const [showNew, setShowNew] = useState(false);
@@ -25,7 +23,6 @@ export default function MainLayout() {
   const [showInfo, setShowInfo] = useState(false);
   const [showProfile, setShowProfile] = useState(false);
   const [mobileChatOpen, setMobileChatOpen] = useState(false);
-  const [fullChat, setFullChat] = useState<Chat | null>(null);
 
   usePushNotifications(!!user);
 
@@ -58,12 +55,10 @@ export default function MainLayout() {
       const { data } = await api.get(`/api/chats/${chat.id}`);
       const merged = { ...chat, ...data };
       setActiveChat(merged);
-      setFullChat(merged);
       updateChat({ id: chat.id, unreadCount: 0 });
       wsClient.send('read_messages', { chatId: chat.id });
     } catch {
-      setActiveChat(chat);
-      setFullChat(chat);
+      setActiveChat({ ...chat, myRole: chat.myRole || chat.role });
     }
     setMobileChatOpen(true);
     setShowInfo(false);
@@ -99,7 +94,6 @@ export default function MainLayout() {
         // fallback: open by direct API call
         const { data: fullChatData } = await api.get(`/api/chats/${chatData.id}`);
         setActiveChat(fullChatData);
-        setFullChat(fullChatData);
         setMobileChatOpen(true);
         setShowInfo(false);
       }
@@ -212,12 +206,12 @@ export default function MainLayout() {
 
       {/* Main Chat Area */}
       <div className={`flex-1 flex flex-col ${!mobileChatOpen ? 'hidden md:flex' : 'flex'}`}>
-        {activeChat && fullChat ? (
+        {activeChat ? (
           <>
             <div className="flex flex-1 overflow-hidden">
               <div className="flex-1 flex flex-col min-w-0">
                 <ChatHeader
-                  chat={fullChat}
+                  chat={activeChat}
                   onBack={() => { setMobileChatOpen(false); setActiveChat(null); }}
                   onRefresh={() => openChat(activeChat)}
                   onShowInfo={() => setShowInfo(!showInfo)}
@@ -234,7 +228,7 @@ export default function MainLayout() {
               {/* Info Panel */}
               {showInfo && (
                 <ChatInfoPanel
-                  chat={fullChat}
+                  chat={activeChat}
                   onClose={() => setShowInfo(false)}
                   onRefresh={() => openChat(activeChat)}
                 />