- /settings with profile, security, and account sections
- Profile: edit display name and bio
- Security: list passkeys with device labels, add/delete with
last-passkey warning
- Account: email change with magic link verification, account
deletion with username confirmation
- Settings link in nav for authenticated users
- E2E tests: auth guard, profile editing, passkey add/delete,
last-passkey warning, account deletion, nav visibility
- i18n: full en + de translations for all settings UI
Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>
