Consistently use a `star` icon to highlight the default column of a
project.
The icon is both shown while viewing the project, as well as while
changing the default status of this column.
<img width="1065" height="370" alt="image"
src="https://github.com/user-attachments/assets/1ca5773d-8eec-4b90-ad0b-22b1f4bd4cfd"
/>
de69e7f16a