fix(bec_status_box): restyle the QWidget view when the theme changes

Co-Authored-By: Claude Opus 5.5 (1M context) <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_015TeMnCZ9FjLpwiDkPu6K9j

bec_widgets/widgets/services/bec_status_box/bec_status_box.py

@@ -271,6 +271,16 @@ class BECStatusBox(BECWidget, CompactPopupWidget):
         )
         self.tooltip = f"{self.model.headline}\n{self.model.detail}".strip()
 
+    @SafeSlot(str)
+    def apply_theme(self, theme: str):
+        """Restyle the QWidget view after a theme change. The QML view follows the theme itself.
+
+        Args:
+            theme (str): The name of the new theme.
+        """
+        if isinstance(self.view, StatusBoxWidgetView):
+            self.view.apply_theme()
+
     def cleanup(self):
         """Cleanup the BECStatusBox widget."""
         self.bec_service_status.cleanup()

tests/unit_tests/test_bec_status_box.py

@@ -257,3 +257,22 @@ def test_build_rows_order_and_groups():
     assert [r.group for r in rows] == [CORE_GROUP, CORE_GROUP, OTHER_GROUP, OTHER_GROUP]
     assert rows[1].tone == "emergency"
     assert rows[3].status == "NOTCONNECTED"
+
+
+def test_widget_view_follows_theme(qtbot, mocked_client):
+    from bec_widgets.utils.colors import apply_theme
+
+    box = create_widget(
+        qtbot,
+        BECStatusBox,
+        client=mocked_client,
+        bec_service_status_mixin=mock.MagicMock(),
+        view="widgets",
+    )
+    box.update_service_status(*_all_services())
+    apply_theme("dark")
+    dark = box.view.styleSheet()
+    apply_theme("light")
+    qtbot.waitUntil(lambda: box.view.styleSheet() != dark)
+    apply_theme("dark")
+    qtbot.waitUntil(lambda: box.view.styleSheet() == dark)