handleWhoami method
Implementation
Future<void> handleWhoami() async {
final creds = await _requireAuth();
print('\ud83d\udce7 Email: ${creds['email']}');
print('\ud83c\udd94 User ID: ${creds['userId']}');
print('\ud83d\udcc1 Root: ${creds['baseFolderUUID']}');
final keys = (creds['masterKeys'] ?? '').toString().split('|');
print('\ud83d\udd11 Master Keys: ${keys.length}');
}