refactor(tests): Add strict type hints to fourth batch of test files

tests/test_live_gui_integration.py

@@ -1,3 +1,4 @@
+from typing import Generator
 import pytest
 from unittest.mock import MagicMock, patch, AsyncMock
 import asyncio
@@ -7,7 +8,7 @@ from events import UserRequestEvent
 import ai_client
 
 @pytest.fixture
-def mock_app() -> None:
+def mock_app() -> Generator[App, None, None]:
  with (
   patch('gui_2.load_config', return_value={
     "ai": {"provider": "gemini", "model": "model-1", "temperature": 0.0, "max_tokens": 100, "history_trunc_limit": 1000},
@@ -33,7 +34,7 @@ def mock_app() -> None:
   # so we just let it daemon-exit.
 
 @pytest.mark.timeout(10)
-def test_user_request_integration_flow(mock_app):
+def test_user_request_integration_flow(mock_app: App) -> None:
  """
     Verifies that pushing a UserRequestEvent to the event_queue:
     1. Triggers ai_client.send
@@ -83,7 +84,7 @@ def test_user_request_integration_flow(mock_app):
   assert app.ai_status == "done"
 
 @pytest.mark.timeout(10)
-def test_user_request_error_handling(mock_app):
+def test_user_request_error_handling(mock_app: App) -> None:
  """
     Verifies that if ai_client.send raises an exception, the UI is updated with the error state.
     """