- real Mantine login form -> POST /api/auth/login; 401 inline error; redirect when already authed
- ProtectedRoute: loading state, preserves intended destination, gates force_password_change
- ChangePasswordPage forced-change gate -> POST /api/auth/password
- logout control in AppLayout nav -> POST /api/auth/logout
- typed client only; vitest tests for the login flow
tliu93