chore: apply ruff auto-fixes and remove dead AST scripts

tests/test_gui_streaming.py

@@ -1,8 +1,6 @@
 import pytest
-import asyncio
-from unittest.mock import patch, MagicMock
+from unittest.mock import patch
 from gui_2 import App
-import events
 
 @pytest.fixture
 def app_instance():