Ensure to delete preview sites only when the user is authenticated

[ivan-ottinger]

Related issues

• Resolves STU-659

Proposed Changes

• ensure to delete preview sites only when the user is authenticated

Testing Instructions

1. Check out the PR branch and build the app with npm start.
2. Create a preview site for one of your local Studio sites.
3. Check the current number of preview sites in the Settings → Usage tab.
4. Log out from WordPress.com.
5. Try to delete that local site that has preview site linked to it.
6. The local site should get deleted without any error message.
7. When you check the Settings → Usage tab, the number of preview sites should not be reduced - as the site has not been deleted.
8. Repeat the steps 2 and 3.
9. Go offline (e.g. by deactivating wifi).
10. Repeat the steps 5 to 7.

Pre-merge Checklist

• Have you checked for TypeScript, React or other console errors?

[gcsecsey]

Thanks Ivan for quickly creating a fix! This works well and the changes LGTM!

Deleting the site while logged out:

CleanShot.2025-08-06.at.11.06.05.mp4

Deleting the site while offline:

CleanShot.2025-08-06.at.11.09.38.mp4