chore(fix): Resolve regressions in history logic, track startup, and GUI performance

tests/test_mma_concurrent_tracks_stress_sim.py

@@ -31,6 +31,10 @@ def test_mma_concurrent_tracks_stress(live_gui) -> None:
  client = api_hook_client.ApiHookClient()
  assert client.wait_for_server(timeout=15), "Hook server did not start"
 
+ # 0. Reset session to clear any stale state
+ client.click('btn_reset')
+ time.sleep(1.0)
+
  # 1. Setup mock provider
  client.set_value('current_provider', 'gemini_cli')
  client.set_value('gcli_path', f'"{sys.executable}" "{os.path.abspath("tests/mock_concurrent_mma.py")}"')