Type for invitation.expiresAt field is Date, should be number.

Have to do `as unknown as number` for it to be correct:
<img width="938" height="97" alt="Image" src="https://github.com/user-attachments/assets/9264de27-cb07-4382-846b-f598e4c443fa" />
Proof it's a number:
<img width="427" height="195" alt="Image" src="https://github.com/user-attachments/assets/832db80b-8dfc-44eb-888b-0813e78e3cb0" />