Apply EnforcesRoles trait in ProductResource and ProductSaleResource

Import was present but use statement inside class body was missing,
so role checks had no effect on these two resources.

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

app/Filament/User/Resources/ProductSaleResource.php

@@ -20,6 +20,8 @@ use Filament\Forms\Components\DatePicker;
 use Filament\Tables\Columns\TextColumn;
 
 class ProductSaleResource extends Resource {
+    use EnforcesRoles;
+
     protected static ?string $model = ProductSale::class;
 
     protected static ?string $navigationIcon = 'heroicon-o-arrow-up-on-square';