- Extract throwVerificationError helper in verify-signing-two-factor-token.ts
- Extract throwIssuanceDenied helper in issue-signing-two-factor-token.ts
- Eliminate duplicated attemptsRemaining state in UI component
- Use imported SIGNING_2FA_VERIFY_REASON_CODES constants
- Add statusQuery.refetch() after failed verify for single source of truth
- Fix TypeScript control flow with explicit returns after throws