Three fixes for MFA enrollment and sign-in:
- Defer TOTP registration with Logto until after 6-digit code verification.
Previously setupTotp() immediately registered the secret, so abandoning
enrollment mid-way left MFA active without a working authenticator.
- Move entire MFA enrollment flow (QR code, verify, backup codes) into a
Modal dialog instead of replacing the Card content inline.
- Fix sign-in MFA flow: submitMfa() no longer calls identifyUser() after
TOTP verify — user is already identified, and passing the MFA
verificationId to identification returned 422 ("method not activated").
Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>
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