Passkeys
User settings page shows registered passkeys
When on the user settings page
the Passkeys section shows all passkeys registered to your account.

How to delete a passkey
When on the user settings page
Each passkey row has a Delete button.
Clicking Delete removes the passkey from the table.
The last remaining passkey has no Delete button.

How to add additional passkeys
When on the user settings page,
clicking 'Add passkey' sends a registration email.
Following the link in the email navigates to the passkey registration page.
On the registration page, give the passkey a nickname to identify it later.
Clicking Register adds the new passkey to your account.
Log back in to confirm the new passkey works.
The new passkey now appears in the Passkeys table with its nickname.
