[Settings, Passkey] Should show error messages when failing to add passkeys

ux minor, reported by qa

## Background

Build: Staging
Device: Chrome, Firefox on win 11, S21 FE (Android 12), iPhone 12 mini (iOS 16), Samsung note 9 (Android 12)

## Steps

1. Log in to the application that has disabled the passkey feature
2. Go to the Passkey settings page by direct URL access (`host/settings/passkey`)
3. Add a passkey, or trigger the add passkey dialog and then close it
4. See no error is shown when failing to add passkeys

## Expected behavior

Should show error messages when failing to add passkeys

## Screenshots

[https://user-images.githubusercontent.com/67095825/190613391-23132121-d74e-4c17-ba3c-75db8ea0a40f.mp4]()

Start by reproducing the failure from the /settings/passkey URL with passkeys disabled, using the listed browsers or devices. Trace the passkey add dialog and its close or failure path; done means an appropriate error message is shown when adding a passkey fails.

Written by the indexing model from the issue text.