handleChatData 프로토콜에 맞게 수정

@@ -11,12 +11,16 @@ export const Chat: React.FC = () => {
   const messageEndRef = useRef<HTMLDivElement | null>(null);
 
   useEffect(() => {
-    socket.on(MessageType.ROOM_CHAT, (data: ChatData) => {
-      setChatLines([...chatLines, data]);
-    });
+    const handleChatData = (message: RawMessage) => {
+      if (message.type === MessageType.ROOM_CHAT) {
+        setChatLines(oldChatLines => [...oldChatLines, message.message as ChatData]);
+      }
+    }
+
+    socket.on('msg', handleChatData);
 
     return () => {
-      socket.off(MessageType.ROOM_CHAT);
+      socket.off('msg', handleChatData);
     }
   }, []);
 
@@ -28,7 +32,7 @@ export const Chat: React.FC = () => {
 
   const handleEnter = useCallback((e: React.KeyboardEvent) => {
     if (e.key === 'Enter') {
-      setChatLines([...chatLines, { sender: 'me', message: input }]);
+      // setChatLines([...chatLines, { sender: 'me', message: input }]);
       
       const rawMessage: RawMessage = {
         type: MessageType.ROOM_CHAT,