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

tests/test_gui_updates.py

@@ -3,6 +3,7 @@ from unittest.mock import patch, MagicMock
 import importlib.util
 import sys
 import os
+from typing import Any
 import dearpygui.dearpygui as dpg
 
 # Ensure project root is in path for imports
@@ -40,7 +41,7 @@ def app_instance() -> None:
   yield app
  dpg.destroy_context()
 
-def test_telemetry_panel_updates_correctly(app_instance):
+def test_telemetry_panel_updates_correctly(app_instance: Any) -> None:
  """
     Tests that the _update_performance_diagnostics method correctly updates
     DPG widgets based on the stats from ai_client.
@@ -71,7 +72,7 @@ def test_telemetry_panel_updates_correctly(app_instance):
   # Assert Gemini-specific widget was hidden
   mock_configure_item.assert_any_call("gemini_cache_label", show=False)
 
-def test_cache_data_display_updates_correctly(app_instance):
+def test_cache_data_display_updates_correctly(app_instance: Any) -> None:
  """
     Tests that the _update_performance_diagnostics method correctly updates the
     GUI with Gemini cache statistics when the provider is set to Gemini.