Created attachment 179570 [details]
Bug demonstration

SUMMARY
All comboboxes in the "Window Rules" dialog displays no text in the dropdown list.

STEPS TO REPRODUCE
1. Start `systemsettings kcm_kwinrules`;
2. Click button "Add new...";
3. Click on "Window types" combobox.

OBSERVED RESULT
No text in the dropdown is displayed.

EXPECTED RESULT
Options text should be visible.

SOFTWARE/OS VERSIONS
Operating System: Fedora Linux 41
KDE Plasma Version: 6.3.3
KDE Frameworks Version: 6.12.0
Qt Version: 6.8.2
Kernel Version: 6.13.6-200.fc41.x86_64 (64-bit)
Graphics Platform: Wayland
Processors: 16 × AMD Ryzen 7 5700X 8-Core Processor
Memory: 31.2 ГиБ of RAM
Graphics Processor: NVIDIA GeForce RTX 3070
Manufacturer: ASUS

ADDITIONAL INFORMATION
When starting from the console I see this errors:
```
qrc:/kcm/kcm_kwinrules/OptionsComboBox.qml:88: ReferenceError: bitMask is not defined
qrc:/kcm/kcm_kwinrules/OptionsComboBox.qml:101:17: Unable to assign [undefined] to QString
qrc:/kcm/kcm_kwinrules/OptionsComboBox.qml:115:13: Unable to assign [undefined] to QString
qrc:/kcm/kcm_kwinrules/OptionsComboBox.qml:88: ReferenceError: bitMask is not defined
qrc:/kcm/kcm_kwinrules/OptionsComboBox.qml:101:17: Unable to assign [undefined] to QString
qrc:/kcm/kcm_kwinrules/OptionsComboBox.qml:115:13: Unable to assign [undefined] to QString
qrc:/kcm/kcm_kwinrules/OptionsComboBox.qml:88: ReferenceError: bitMask is not defined
qrc:/kcm/kcm_kwinrules/OptionsComboBox.qml:101:17: Unable to assign [undefined] to QString
qrc:/kcm/kcm_kwinrules/OptionsComboBox.qml:115:13: Unable to assign [undefined] to QString
```