Allow customizing refresh on RFBPA

lib/components/refresh_future_builder.dart

@@ -138,9 +138,10 @@ enum RefreshFutureBuilderState {
 
 class RefreshFutureBuilderProviderAdapter<T> extends ConsumerWidget {
   final Provider<AsyncValue<T>> futureProvider;
+  final Future Function()? refresh;
   final Widget Function(BuildContext context, Future Function() refresh, Future Function(Future<T> Function()) replaceFuture, RefreshFutureBuilderSnapshot<T> snapshot) builder;
 
-  const RefreshFutureBuilderProviderAdapter({required this.futureProvider, required this.builder, super.key});
+  const RefreshFutureBuilderProviderAdapter({required this.futureProvider, required this.builder, this.refresh, super.key});
   
   @override
   Widget build(BuildContext context, WidgetRef ref) {
@@ -148,7 +149,7 @@ class RefreshFutureBuilderProviderAdapter<T> extends ConsumerWidget {
 
     return builder(
       context,
-      () async {
+      refresh ?? () async {
         ref.invalidate(futureProvider);
       },
       (_) => throw UnimplementedError('Cannot replace the future when adapting a FutureProvider'),
@@ -157,7 +158,7 @@ class RefreshFutureBuilderProviderAdapter<T> extends ConsumerWidget {
           ? RefreshFutureBuilderSnapshot.refresh(data)
           : RefreshFutureBuilderSnapshot.withData(data), 
         error: (error, st) => value.isLoading || value.isRefreshing 
-          ? RefreshFutureBuilderSnapshot.refreshError(value.value, value.error, value.stackTrace)
+          ? RefreshFutureBuilderSnapshot.refreshError(value.hasValue ? value.value : null, value.error, value.stackTrace)
           : RefreshFutureBuilderSnapshot.withError(error, st), 
         loading: () {
           if (value.hasValue) {