fix: some fixes

lib/pages/main.dart

@@ -73,6 +73,7 @@ class _MainPageState extends State<MainPage> {
   bool isSearching = false;
   List<GymCategory> categories = [];
   GymCategory? selectedCategory;
+  final ScrollController _scrollController = ScrollController();
 
   @override
   void initState() {
@@ -122,7 +123,7 @@ class _MainPageState extends State<MainPage> {
     });
   }
 
-  void _onSearch() async {
+  void _onSearch() {
     final categoryId = selectedCategory == null ? '' : selectedCategory!.id;
     _searchItems(searchText: searchText, categoryId: categoryId);
   }
@@ -250,7 +251,9 @@ class _MainPageState extends State<MainPage> {
               onEndOfPage: _onLoad,
               isLoading: isLoading,
               child: Scrollbar(
+                controller: _scrollController,
                 child: ListView(
+                  controller: _scrollController,
                   children: [
                     filteredData.isEmpty &&
                             (searchText != '' || selectedCategory != null) &&