fix: img loading on changing search text

lib/pages/main.dart

@@ -73,6 +73,7 @@ class _MainPageState extends State<MainPage> {
   List<GymCategory> categories = [];
   GymCategory? selectedCategory;
   final ScrollController _scrollController = ScrollController();
+  final TextEditingController _searchField = TextEditingController();
 
   @override
   void initState() {
@@ -123,6 +124,9 @@ class _MainPageState extends State<MainPage> {
 
   void _onSearch() {
     final categoryId = selectedCategory == null ? '' : selectedCategory!.id;
+    setState(() {
+      searchText = _searchField.text.trim().toLowerCase();
+    });
     _searchItems(searchText: searchText, categoryId: categoryId);
   }
 
@@ -141,12 +145,13 @@ class _MainPageState extends State<MainPage> {
               children: [
                 Expanded(
                   child: TextField(
-                    onChanged: (value) => setState(() {
+                    onChanged: (value) {
                       searchText = value.trim().toLowerCase();
                       if (searchText == '') {
                         _onSearch();
                       }
-                    }),
+                    },
+                    controller: _searchField,
                     textInputAction: TextInputAction.search,
                     onSubmitted: (_) => _onSearch(),
                     decoration: InputDecoration(