mobile chat themes

templates/chat.html

@@ -702,6 +702,7 @@ function filterRooms() { renderRooms(); }
 async function selectRoom(roomId) {
     currentRoomId = roomId;
     oldestMsgId = null;
+    markRead(roomId);  // 立即标记已读，使聊天气泡消失
     document.getElementById('emptyState').classList.add('hidden');
     // 隐藏通知详情
     const nd = document.getElementById('notifDetailView');
@@ -729,7 +730,6 @@ async function selectRoom(roomId) {
     }
     renderRooms();
     await loadMessages(roomId);
-    markRead(roomId);
 }
 
 function updateChatHeaderExamStatus(room) {