Backup (recovery) codes must be viewable ONLY at the moment they are
generated — at first-factor enrollment or on regenerate — and NEVER
re-viewable afterward from "Backup-Codes verwalten".
- Modals\RecoveryCodes: add server-gated $revealed. mount() pulls a
one-time session flag (2fa.codes_fresh); regenerate() sets it. render()
emits codes ONLY when revealed, so a client cannot tamper a flag to
re-view stored codes.
- View: revealed state shows codes grid + download + warning + close;
hidden state shows a security notice + Neu erzeugen + close (no codes,
no download).
- TwoFactorSetup::confirm() and WebauthnKeys::register() put
2fa.codes_fresh on first-factor code generation (put, survives the
redirect + later openModal request).
- Add recovery_hidden_notice (DE/EN parity).
- Tests: manage view hides codes; fresh flag reveals once; regenerate
reveals the new set; first-factor paths set the flag.
Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
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