fix: limit the number of selected frameworks to two in message handling

app.py

@@ -186,7 +186,7 @@ async def on_message(message: cl.Message):
     for name in file_names:
         if cl.user_session.get(name) is True:
             base64_txt = file_contents.get(name)
-            if base64_txt and len(framework_names) < 3:
+            if base64_txt and len(framework_names) < 2:  # Limit to 2 frameworks
                 framework_names.append(name)
                 selected_files_content.append(
                     {