chore(tech-debt): Finalize gui_2.py cleanup and test suite discipline

tests/test_mma_ticket_actions.py

@@ -3,24 +3,6 @@ import pytest
 from unittest.mock import patch, MagicMock
 from gui_2 import App
 
-@pytest.fixture
-def app_instance() -> Generator[App, None, None]:
- with (
-  patch('gui_2.load_config', return_value={'ai': {}, 'projects': {}}),
-  patch('gui_2.save_config'),
-  patch('gui_2.project_manager'),
-  patch('gui_2.session_logger'),
-  patch('gui_2.immapp.run'),
-  patch.object(App, '_load_active_project'),
-  patch.object(App, '_fetch_models'),
-  patch.object(App, '_load_fonts'),
-  patch.object(App, '_post_init')
- ):
-  app = App()
-  app.active_tickets = []
-  app._loop = MagicMock()
-  yield app
-
 def test_cb_ticket_retry(app_instance: App) -> None:
  ticket_id = "test_ticket_1"
  app_instance.active_tickets = [{"id": ticket_id, "status": "failed"}]