Turn the signed-in guest into a real account

{
  "user": {
    "id": "01M5Y1G7AF0N78A9EP71BV68MT",
    "email": "ada@example.com",
    "is_anonymous": false,
    "username": "ada",
    "name": "Ada Lovelace",
    "avatar_url": null,
    "email_verified": true,
    "email_verified_at": "2026-10-27T09:30:00+00:00",
    "user_metadata": {},
    "app_metadata": {},
    "roles": [],
    "mfa_enabled": false,
    "identities": [],
    "created_at": "2026-10-27T09:30:00+00:00",
    "last_sign_in_at": "2026-10-27T09:30:00+00:00"
  },
  "verification_sent": true
}