fixes before build

lib/products_screen.dart

@@ -180,10 +180,16 @@ class _ProductsScreenState extends State<ProductsScreen> {
         for (final item in _products ?? const <Product>[])
           if (item.id == product.id) item.copyWith(favourite: next) else item,
       ];
+      if (_sort == ProductSort.favourite && !next) {
+        _products = [
+          for (final item in _products!)
+            if (item.id != product.id) item,
+        ];
+        if (_products!.isEmpty) _editing = false;
+      }
     });
     try {
       await widget.repository.setFavourite(product.id, next);
-      if (_sort == ProductSort.start && mounted) _load();
     } catch (_) {
       if (mounted) _load();
     }
@@ -265,11 +271,12 @@ class _ProductsScreenState extends State<ProductsScreen> {
                 ),
                 ButtonSegment(
                   value: ProductSort.preferred,
-                  label: Text('Preferred'),
+                  label: Text('Frequent'),
                 ),
                 ButtonSegment(
-                  value: ProductSort.start,
-                  label: Text('Start'),
+                  value: ProductSort.favourite,
+                  icon: Icon(Icons.star),
+                  label: Text('Star'),
                 ),
               ],
               selected: {_sort},
@@ -311,7 +318,9 @@ class _ProductsScreenState extends State<ProductsScreen> {
     if (_products!.isEmpty) {
       return Center(
         child: Text(
-          'Confirmed receipt items will show up here.',
+          _sort == ProductSort.favourite
+              ? 'Star products to keep them as favourites.'
+              : 'Confirmed receipt items will show up here.',
           textAlign: TextAlign.center,
           style: theme.textTheme.bodyLarge,
         ),