feat: enhance inventory management with category and location filters

flutter/lib/features/inventory/domain/inventory_item.dart

@@ -2,6 +2,8 @@ class InventoryItem {
   final int id;
   final int productId;
   final String productName;
+  final String? productCanonicalName;
+  final String? categoryPath;
   final double quantity;
   final String unit;
   final String? location;
@@ -15,6 +17,8 @@ class InventoryItem {
     required this.id,
     required this.productId,
     required this.productName,
+    this.productCanonicalName,
+    this.categoryPath,
     required this.quantity,
     required this.unit,
     this.location,
@@ -25,11 +29,27 @@ class InventoryItem {
     this.comment,
   });
 
+  String get displayName {
+    if (productCanonicalName != null && productCanonicalName!.trim().isNotEmpty) {
+      return productCanonicalName!;
+    }
+    return productName;
+  }
+
+  String get l1Category {
+    final path = categoryPath?.trim();
+    if (path == null || path.isEmpty) return 'Ovrigt';
+    return path.split('>').first.trim();
+  }
+
   factory InventoryItem.fromJson(Map<String, dynamic> json) {
+    final product = (json['product'] as Map<String, dynamic>?) ?? const {};
     return InventoryItem(
       id: json['id'] as int,
       productId: json['productId'] as int,
-      productName: (json['product'] as Map<String, dynamic>?)?['name'] as String? ?? '',
+      productName: product['name'] as String? ?? '',
+      productCanonicalName: product['canonicalName'] as String?,
+      categoryPath: _buildCategoryPath(product['categoryRef']),
       quantity: double.tryParse(json['quantity']?.toString() ?? '0') ?? 0,
       unit: json['unit'] as String? ?? '',
       location: json['location'] as String?,
@@ -40,4 +60,21 @@ class InventoryItem {
       comment: json['comment'] as String?,
     );
   }
+
+  static String? _buildCategoryPath(dynamic rawCategoryRef) {
+    if (rawCategoryRef is! Map<String, dynamic>) return null;
+
+    final names = <String>[];
+    dynamic current = rawCategoryRef;
+    while (current is Map<String, dynamic>) {
+      final name = current['name']?.toString().trim();
+      if (name != null && name.isNotEmpty) {
+        names.insert(0, name);
+      }
+      current = current['parent'];
+    }
+
+    if (names.isEmpty) return null;
+    return names.join(' > ');
+  }
 }