- Login: hide passkey button when browser lacks WebAuthn, default to
magic link mode, hide "back to passkey" link
- Register: detect passkey support and offer magic link registration as
fallback. New server-side registerWithMagicLink() creates account
without credential and sends verification email.
- Home: show passkey count for logged-in users, show amber unsupported
message instead of hiding the add-passkey prompt entirely
- i18n: add passkeyNotSupported, passkeyNotSupportedRegister,
registerWithMagicLink, passkeyStatus keys (en + de)
Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>
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