wip: thread revamp

backend/src/app.py

@@ -19,7 +19,6 @@ import agents as agents_mod
 import temporary as tmp
 from server import start_server
 from drives import init_drives
-from chat import ChatView, Message, MESSAGE_PAGE_SIZE
 from remote import RemoteConnection, RemoteToolSpec, parse_function_specs
 
 from app_mixins import ChatMixin, AgentMixin