1. Passkey Conditional UI: autocomplete="username webauthn" on email
field enables browser passkey suggestions in autofill dropdown
2. Trust Device checkbox: "Diesem Gerät 30 Tage vertrauen" option
during 2FA verification (uses Better Auth trust_device cookie)
3. Local QR code generation: replaced external api.qrserver.com with
local qrcode package for 2FA setup (no external dependency)
4. SecurityOnboarding component: post-registration wizard suggesting
passkey setup to new users
5. ChangePassword component: reusable password change form with
validation, visibility toggles, and changePassword() in authService
Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>
