feat: enhance ProductPickerField and ParsedReceiptItem to support category filtering in receipt import

flutter/lib/features/import/domain/parsed_receipt_item.dart

@@ -15,6 +15,7 @@ class ParsedReceiptItem {
   // AI-kategorisuggestion (premium)
   final String? categorySuggestionName;
   final String? categorySuggestionPath;
+  final int? categorySuggestionId;
 
   ParsedReceiptItem({
     required this.rawName,
@@ -29,6 +30,7 @@ class ParsedReceiptItem {
     this.suggestedProductName,
     this.categorySuggestionName,
     this.categorySuggestionPath,
+    this.categorySuggestionId,
   });
 
   factory ParsedReceiptItem.fromJson(Map<String, dynamic> json) {
@@ -46,6 +48,7 @@ class ParsedReceiptItem {
       suggestedProductName: json['suggestedProductName'] as String?,
       categorySuggestionName: cat?['categoryName'] as String?,
       categorySuggestionPath: cat?['path'] as String?,
+      categorySuggestionId: (cat?['categoryId'] as num?)?.toInt(),
     );
   }
 }

flutter/lib/features/import/presentation/receipt_import_tab.dart

@@ -98,14 +98,16 @@ class _EditDialogState extends State<_EditDialog> {
           _productName = item.suggestedProductName;
         });
       } else if (aiCategory != null) {
-        // Öppna pickern med råtexten från kvittot som sökord — kategorinamnet
-        // matchar inte produktnamn, men rawName gör det troligtvis
+        // Öppna pickern filtrerad på AI-föreslagen kategori (categoryId).
+        // Visar bara produkter i den kategorin (eller rawName-sökning om kategorin är tom).
+        final catId = item.categorySuggestionId;
         ProductPickerField.showSheet(
           context,
           products: widget.products,
           value: _productId,
           label: 'Produkt',
           initialQuery: item.rawName,
+          categoryFilter: catId != null ? {catId} : null,
         ).then((id) {
           if (id != null && mounted) {
             setState(() {
@@ -276,7 +278,7 @@ class _ReceiptImportTabState extends ConsumerState<ReceiptImportTab> {
         setState(() {
           _products = list
               .cast<Map<String, dynamic>>()
-              .map((e) => (id: e['id'] as int, name: e['name'] as String))
+              .map((e) => (id: e['id'] as int, name: e['name'] as String, categoryId: (e['categoryId'] as num?)?.toInt()))
               .toList();
           _loadingProducts = false;
         });