Finished inbox, fixed reverse sort order, bloc refactorings

lib/features/inbox/view/widgets/inbox_empty_widget.dart

@@ -0,0 +1,36 @@
+import 'package:flutter/material.dart';
+import 'package:flutter_bloc/flutter_bloc.dart';
+import 'package:paperless_mobile/features/inbox/bloc/inbox_cubit.dart';
+
+class InboxEmptyWidget extends StatelessWidget {
+  const InboxEmptyWidget({
+    Key? key,
+    required GlobalKey<RefreshIndicatorState> emptyStateRefreshIndicatorKey,
+  })  : _emptyStateRefreshIndicatorKey = emptyStateRefreshIndicatorKey,
+        super(key: key);
+
+  final GlobalKey<RefreshIndicatorState> _emptyStateRefreshIndicatorKey;
+
+  @override
+  Widget build(BuildContext context) {
+    return RefreshIndicator(
+      key: _emptyStateRefreshIndicatorKey,
+      onRefresh: () => BlocProvider.of<InboxCubit>(context).loadInbox(),
+      child: Center(
+        child: Column(
+          mainAxisSize: MainAxisSize.max,
+          crossAxisAlignment: CrossAxisAlignment.center,
+          mainAxisAlignment: MainAxisAlignment.center,
+          children: [
+            Text('You do not have unseen documents.'),
+            TextButton(
+              onPressed: () =>
+                  _emptyStateRefreshIndicatorKey.currentState?.show(),
+              child: Text('Refresh'),
+            ),
+          ],
+        ),
+      ),
+    );
+  }
+}