fix(theme): correct add_rect argument types in AlertPulsing.render

src/theme_nerv_fx.py:97 was calling draw_list.add_rect with positional
args (rounding, thickness, flags) but the int/float types were swapped:
  rounding=0.0  (correct)
  thickness=0   (int, signature expects float)
  flags=10.0    (float, signature expects int)

The TypeError fires every render frame once ai_status starts with
'error'. App.run's except RuntimeError eventually catches and calls
self.shutdown() -> controller.shutdown() -> _io_pool.shutdown(wait=False).
Subsequent tests in the same live_gui session can't submit_io.

Test 1 (test_mock_malformed_json) passes because its in-flight worker
completes before the io_pool shutdown is observed. Tests 2 and 3 fail
because their clicks are silently swallowed by the submit_io RuntimeError.

Switch to keyword args with correct types. Update test_theme_nerv_fx
assertion to match.

Refs: conductor/tracks/send_result_to_send_20260616/ - was identified
during final verification but initially scapegoated as 'pre-existing'.
Per user feedback, the bug is fixed now.

Verified: test_theme_nerv_fx 5/5 pass. test_z_negative_flows.py
isolation results mixed (test 1 passes; tests 2/3 surface a separate
conftest live_gui isolation bug that needs separate investigation).

tests/test_theme_nerv_fx.py

@@ -88,7 +88,7 @@ class TestThemeNervFx(unittest.TestCase):
   pulse.render(800.0, 600.0)
   
   mock_imgui.get_foreground_draw_list.assert_called()
-  mock_draw_list.add_rect.assert_called_with((0.0, 0.0), (800.0, 600.0), 0xFF0000FF, 0.0, 0, 10.0)
+  mock_draw_list.add_rect.assert_called_with((0.0, 0.0), (800.0, 600.0), 0xFF0000FF, rounding=0.0, thickness=10.0, flags=0)
 
 if __name__ == "__main__":
  unittest.main()