fix: lỗi hiển thị trong itineraryTimeline

frontend/src/pages/MemberDashboard.tsx

@@ -1681,9 +1681,9 @@ const renderInitialsAvatar = (name: string, sizeClass = 'w-10 h-10 text-sm') =>
               </div>
             )}
 
-            {/* TAB 4: REALTIME CHAT */}
-            {activeTab === 'chats' && (
-              <div className="flex-1 w-full bg-slate-900/40 border-0 md:border border-slate-800/80 md:rounded-3xl overflow-hidden flex animate-in fade-in slide-in-from-bottom-2 duration-300">
+{/* TAB 4: REALTIME CHAT */}
+             {activeTab === 'chats' && (
+               <div className="flex flex-col h-[100dvh] md:h-auto w-full bg-slate-900/40 border-0 md:border border-slate-800/80 md:rounded-3xl overflow-hidden flex animate-in fade-in slide-in-from-bottom-2 duration-300">
                 
                 {/* Chats List sidebar: show if not mobile OR if mobile and no active chat user */}
                 {(!isMobile || !activeChatUser) && (