test: pin the Sample-alignment motion-watch exception

Robot motion switches to the combined view; alignment beginning
switches straight back while busy is still set, and staying busy in
alignment never re-triggers. Piggybacks on the init test's window -
extra MainWindow constructions feed the PySide teardown flake.

Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>

tests/unit/gui/test_main_window.py

@@ -14,7 +14,7 @@ def mock_ui_state():
         yield mock
 
 
-def test_main_window_init(qtbot, mock_ui_state):
+def test_main_window_init(qtbot, mock_ui_state, daq_status_factory):
     with (
         patch("requests.get") as mock_get,
         patch("aare.gui.main_window.DAQWorker"),
@@ -71,6 +71,25 @@ def test_main_window_init(qtbot, mock_ui_state):
         win.data_collection._emit_change_energy()
         assert sent and abs(sent[0] - 12400.0) < 1e-6
 
+        # Motion watch: robot motion switches to the combined beamline view;
+        # alignment beginning switches straight back to the sample camera even
+        # while the busy flag is still set — busy moves during Sample
+        # alignment ARE the alignment, so it never re-triggers the switch.
+        win.update_daq_status(
+            daq_status_factory(state=BeamlineStateEnum.RobotSampleExchange, busy=True)
+        )
+        assert win._watching_motion
+        assert win.video_tab.currentWidget() is win.beamline_combined_panel
+        win.update_daq_status(
+            daq_status_factory(state=BeamlineStateEnum.SampleAlignment, busy=True)
+        )
+        assert not win._watching_motion
+        assert win.video_tab.currentWidget() is win.sample_camera
+        win.update_daq_status(
+            daq_status_factory(state=BeamlineStateEnum.SampleAlignment, busy=True)
+        )
+        assert not win._watching_motion
+
 
 def test_main_window_mount_view(qtbot, mock_ui_state):
     with (