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* feat(mfa): auto-submit 6-digit TOTPs and normalize pasted backup codes Match the UX every major MFA prompt has (GitHub, GitLab, 1Password): the challenge screen and every code-entry dialog now submit automatically once the sixth TOTP digit lands, and the backup-code input accepts pastes with smart-dashes, trailing whitespace, or mixed case without silently truncating the value. Also caps the backup-code input at the correct 11 characters (10 plus a single separator) instead of 12. Shared normalization helpers live in frontend/src/lib/mfa.ts so the challenge and the three account-settings dialogs stay in lockstep. * feat(mfa): warn users when backup codes run low The Account & Security card silently showed a dim count of backup codes remaining, which meant users could drift toward zero without noticing until their phone was already lost. The card now surfaces a warning tone with an alert icon when 1 or 2 codes remain, and swaps to a dedicated destructive warning card with a "Regenerate now" action when the user has used every code. * feat(mfa): gate diagnostic logs behind developer mode Reuses the existing isDebugEnabled() gate so operators investigating a 2FA support ticket can flip Developer Mode on to get per-branch diagnostics (login path taken, replay check outcome, failure counter after a verify, replay-table purge counts), and flip it back off when they are done. Standard lifecycle logs stay on by default: enrolment completed, 2FA disabled, backup codes regenerated, admin reset, SSO bypass toggled, lockout engaged. Nothing that could reveal a TOTP code, base32 secret, backup-code cleartext, or partial-auth JWT is ever logged. * test(mfa): cover drift, invalid formats, lockout recovery, and paste normalization Backend: a TOTP generated for a window that has already slid out is rejected, malformed backup codes (too short, non-alphanumeric, 11-char alphanumeric that matches no hash) all increment failed_attempts, a successful verify clears a below-threshold failure streak, a successful verify after locked_until has passed clears the lockout, a second enroll/start overwrites the prior pending secret, and the backup-code normalizer treats en-dash/em-dash/figure-dash with stray whitespace the same as the canonical form. E2E: low-backup-codes warning renders in the warning tone and the exhausted-codes state flips to the dedicated warning card, a 6-digit TOTP auto-submits without a button click, and a backup code pasted without the separator still signs in. * docs(mfa): auto-submit, paste guidance, and expanded troubleshooting Document that the challenge screen submits automatically on the sixth digit, that backup codes accept the separator and any case, and that the Account & Security card nudges at low code counts. Expands the troubleshooting section with entries for lost or exhausted backup codes and adds a short note to the admin guide about surfacing auth diagnostics via Developer Mode.