refactor(types): auto -> None sweep across entire codebase

Applied 236 return type annotations to functions with no return values
across 100+ files (core modules, tests, scripts, simulations).
Added Phase 4 to python_style_refactor track for remaining 597 items
(untyped params, vars, and functions with return values).

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

tests/test_api_hook_extensions.py

@@ -7,7 +7,7 @@ sys.path.append(os.path.abspath(os.path.join(os.path.dirname(__file__), "..")))
 
 from api_hook_client import ApiHookClient
 
-def test_api_client_has_extensions():
+def test_api_client_has_extensions() -> None:
  client = ApiHookClient()
  # These should fail initially as they are not implemented
  assert hasattr(client, 'select_tab')
@@ -33,7 +33,7 @@ def test_get_indicator_state_integration(live_gui):
  assert 'shown' in response
  assert response['tag'] == "thinking_indicator"
 
-def test_app_processes_new_actions():
+def test_app_processes_new_actions() -> None:
  import gui_legacy
  from unittest.mock import MagicMock, patch
  import dearpygui.dearpygui as dpg