added support for simultan downloads in files and talk, support for background downloads, enhanced loading in files with retry

lib/state/app/infrastructure/loadable_state/loadable_state.dart

@@ -14,6 +14,9 @@ abstract class LoadableState<TState> with _$LoadableState<TState> {
     required int? lastFetch,
     required void Function()? reFetch,
     required LoadingError? error,
+    // Transient progress note under the primary loading spinner (e.g. retry
+    // progress). Lives only within one fetch cycle — never persisted.
+    String? statusText,
   }) = _LoadableState<TState>;
 
   bool _hasError() => error != null;