fix(test): Restore performance threshold bounds and add profiling to test

tests/test_gui2_performance.py

@@ -26,6 +26,8 @@ def test_performance_benchmarking(live_gui: tuple) -> None:
  client = ApiHookClient()
  # Wait for app to stabilize and render some frames
  time.sleep(3.0)
+ client.set_value("perf_profiling_enabled", True)
+ time.sleep(0.5)
  # Collect metrics over 5 seconds
  fps_values = []
  cpu_values = []