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

lib/state/app/infrastructure/utility_widgets/loadable_hydrated_bloc/loadable_hydrated_bloc.dart

@@ -35,10 +35,24 @@ abstract class LoadableHydratedBloc<
           lastFetch: state.lastFetch,
           reFetch: retry,
           error: state.error,
+          statusText: state.statusText,
         ),
       );
     });
 
+    on<LoadingStatus<TState>>(
+      (event, emit) => emit(
+        LoadableState(
+          isLoading: state.isLoading,
+          data: innerState,
+          lastFetch: state.lastFetch,
+          reFetch: state.reFetch,
+          error: state.error,
+          statusText: event.statusText,
+        ),
+      ),
+    );
+
     on<DataGathered<TState>>(
       (event, emit) => emit(
         LoadableState(

lib/state/app/infrastructure/utility_widgets/loadable_hydrated_bloc/loadable_hydrated_bloc_event.dart

@@ -19,4 +19,12 @@ class Error<TState> extends LoadableHydratedBlocEvent<TState> {
 
 class RefetchStarted<TState> extends LoadableHydratedBlocEvent<TState> {}
 
+/// Sets the state's `statusText` — a transient progress note under the
+/// primary loading spinner (e.g. "Erneuter Versuch (2 von 3) …"). Cleared
+/// automatically by [DataGathered], [Error], [RefetchStarted] and [Reset].
+class LoadingStatus<TState> extends LoadableHydratedBlocEvent<TState> {
+  final String? statusText;
+  LoadingStatus(this.statusText);
+}
+
 class Reset<TState> extends LoadableHydratedBlocEvent<TState> {}