Markdown message (half) support

backend/src/app_mixins/chat.py

@@ -122,7 +122,7 @@ class ChatMixin:
                 sender=sender,
                 kind=kind or 'message',
                 subkind=subkind,
-                #format=format,
+                format=format,
                 content=initial_content,
                 thread_id=thread_id
             )
@@ -159,7 +159,7 @@ class ChatMixin:
             for agent_id in agent_ids:
                 if str(agent_id) != str(sender):
                     await self.notify_message_to_agent(agent_id, message)
-        
+
         def notify_users():
             nonlocal updating
             self.notify_message_to_user(chat_owner_id, message, updating)