Sửa lần 6 để gửi được ảnh và pdf

src/components/ChatArea.jsx

@@ -1035,13 +1035,10 @@ function ChatArea({
         }
 
         // Send via WebSocket (with real URL if upload succeeded)
+        // Backend will detect @StudyBot mention and call agent with the file URL automatically
         console.log("[ChatArea] sendMessage:", { roomId: room, content: contentTrimmed, tempId: msgTempId, hasAttachment: !!attachment });
         socketService.sendMessage({ roomId: room, content: contentTrimmed, tempId: msgTempId, attachment });
 
-        if (files?.length > 0 && /@StudyBot/i.test(contentTrimmed)) {
-          callStudyBotWithFile(contentTrimmed, files[0], null);
-        }
-
         // Stop typing
         socketService.emitStopTyping(room);
         if (typingTimeoutRef.current) {

src/store/slices/messageSlice.js

@@ -19,6 +19,7 @@ function normalizeRoomMessage(msg) {
     created_at: msg.created_at,
     is_pinned: msg.is_pinned || false,
     reply_to_id: msg.reply_to_id || null,
+    attachments: msg.attachments || [],
   };
 }