implemented native share intent support for android and ios with chat and folder pickers

lib/view/pages/files/widgets/add_file_menu.dart

@@ -21,7 +21,7 @@ void showAddFileSheet(
         title: const Text('Ordner erstellen'),
         onTap: () {
           Navigator.of(sheetCtx).pop();
-          _showCreateFolderDialog(context, bloc);
+          showCreateFolderDialog(context, bloc);
         },
       ),
       ListTile(
@@ -56,7 +56,7 @@ void showAddFileSheet(
   );
 }
 
-void _showCreateFolderDialog(BuildContext context, FilesBloc bloc) {
+void showCreateFolderDialog(BuildContext context, FilesBloc bloc) {
   final inputController = TextEditingController();
   showDialog(
     context: context,