Taskbar widgets overlap application buttons instead of reserving space

The taskbar indicators overlap open application buttons. Their width is not reserved by the taskbar layout, so application icons and titles are rendered underneath the indicators (Windows 11, ver 1.4.8).

<img width="606" height="48" alt="Image" src="https://github.com/user-attachments/assets/fc2f9597-bf17-46f8-8e9d-9fcae7e5a562" />

