Feature request: Allow users to log out or delete their account

> from [the ticket](https://app.plain.com/workspace/w_01JE9TRRX9KT61D8P2CH77XDQM/thread/th_01KDZ8XG0ECH3Y1NDSP5CFXPG1/)

Users should be able to log out of their account or delete their account entirely when on the onboarding:

<img width="616" height="727" alt="Image" src="https://github.com/user-attachments/assets/88c99975-1740-4062-9b5b-cc8057109ea9" />