Session management:
- GET /auth/sessions and DELETE /auth/sessions/:id endpoints
- listSessions() and revokeSession() in shared-auth client
- SessionManager component: active sessions list with device info,
"Aktuell" badge, revoke individual or all other sessions
- Integrated in ManaCore settings page
Account lockout UX:
- Dedicated amber lockout banner (distinct from generic rate-limit)
- "Konto vorübergehend gesperrt" with MM:SS countdown
- "Passwort zurücksetzen" link as alternative action
- formatCountdown helper for clean time display
Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>
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