fix: cast the mocked daq.unmount for basedpyright on CI

CI's basedpyright (latest from the index, newer than the local venv)
types win.daq as the real DAQWorker, so assert_not_called on the
patched-in MagicMock flagged the two new gate-test lines.

Note: the pytest job segfaults are NOT from this branch — plain
origin/main crashes 2/4 runs under PySide6 6.11.2 (what CI installs;
uv.lock pins 6.9.0 which is stable). Needs a separate dependency fix.

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

tests/unit/gui/test_main_window.py

@@ -1,3 +1,4 @@
+from typing import cast
 from unittest.mock import MagicMock, patch
 
 import pytest
@@ -105,16 +106,18 @@ def test_main_window_init(qtbot, mock_ui_state, daq_status_factory):
             == "Manual collection stopped: detector error."
         )
 
-        # Manual unmount respects the hutch PSS gate.
+        # Manual unmount respects the hutch PSS gate. cast: win.daq is a
+        # patched-in MagicMock, but pyright sees the real DAQWorker type.
+        unmount_mock = cast(MagicMock, win.daq.unmount)
         with (
             patch.object(win, "_hutch_blocks_mount", return_value="hutch open"),
             patch("aare.gui.main_window.QMessageBox"),
         ):
             win._on_manual_unmount_requested()
-        win.daq.unmount.assert_not_called()
+        unmount_mock.assert_not_called()
         with patch.object(win, "_hutch_blocks_mount", return_value=None):
             win._on_manual_unmount_requested()
-        win.daq.unmount.assert_called_once()
+        unmount_mock.assert_called_once()
 
         # Motion watch: only the robot station switches to the combined
         # beamline view. Moving no longer does (users kept losing the sample