базовая логика скачивания обновлений

lib/features/launcher/domain/entities/launcher_exception.dart

@@ -0,0 +1,20 @@
+sealed class LauncherException implements Exception {
+  final String message;
+
+  const LauncherException(this.message);
+
+  @override
+  String toString() => message;
+}
+
+final class LauncherConfigurationException extends LauncherException {
+  const LauncherConfigurationException(super.message);
+}
+
+final class LauncherApiException extends LauncherException {
+  const LauncherApiException(super.message);
+}
+
+final class LauncherSyncException extends LauncherException {
+  const LauncherSyncException(super.message);
+}