"Add record" button missing from overview SearchKit when no subtype is defined

If you have an ECK entity with no subtypes defined, and you go to the SearchKit created for that entity on the "Custom Entities" menu, the button to add new records will be missing.  See attached:

<img width="1574" height="274" alt="Image" src="https://github.com/user-attachments/assets/682a926b-79e1-46c8-9bfe-322e752642be" />


