fix(user): null-safe steamId comparison in updateSettings

src/main/java/auth_service/modules/user/persistence/UserRepositoryImpl.java

@@ -12,6 +12,7 @@ import jakarta.transaction.Transactional;
 import jakarta.validation.constraints.NotNull;
 import org.springframework.stereotype.Repository;
 
+import java.util.Objects;
 import java.util.Optional;
 import java.util.UUID;
 
@@ -76,7 +77,7 @@ public class UserRepositoryImpl implements UserRepository {
         settingsEntity.setLanguage(settings.getLanguage());
         settingsEntity.setTheme(settings.getTheme());
 
-        boolean steamIdChanged = userEntity.getSteamId() != steamId;
+        boolean steamIdChanged = !Objects.equals(userEntity.getSteamId(), steamId);
         userEntity.setSteamId(steamId);
 
         return steamIdChanged;