feat: enhance recipe ingredient model; add raw fields and optional properties for better ingredient handling

flutter/lib/features/recipes/domain/inventory_preview.dart

@@ -2,7 +2,7 @@ enum IngredientStatus { enough, missing, unitMismatch }
 
 class IngredientPreview {
   final int ingredientId;
-  final int productId;
+  final int? productId;
   final String productName;
   final double requiredQuantity;
   final String requiredUnit;
@@ -14,7 +14,7 @@ class IngredientPreview {
 
   const IngredientPreview({
     required this.ingredientId,
-    required this.productId,
+    this.productId,
     required this.productName,
     required this.requiredQuantity,
     required this.requiredUnit,
@@ -34,8 +34,8 @@ class IngredientPreview {
     };
     return IngredientPreview(
       ingredientId: json['ingredientId'] as int,
-      productId: json['productId'] as int,
-      productName: json['productName'] as String,
+      productId: (json['productId'] as num?)?.toInt(),
+      productName: (json['productName'] as String?) ?? (json['rawName'] as String? ?? ''),
       requiredQuantity: (json['requiredQuantity'] as num).toDouble(),
       requiredUnit: json['requiredUnit'] as String? ?? '',
       note: json['note'] as String?,

flutter/lib/features/recipes/domain/parsed_recipe.dart

@@ -19,6 +19,7 @@ class IngredientSuggestion {
 
 class ParsedIngredient {
   final String rawName;
+  final String? rawLine;
   final double quantity;
   final String unit;
   final String? note;
@@ -27,6 +28,7 @@ class ParsedIngredient {
 
   const ParsedIngredient({
     required this.rawName,
+    this.rawLine,
     required this.quantity,
     required this.unit,
     this.note,
@@ -38,6 +40,7 @@ class ParsedIngredient {
     final rawSuggestions = json['suggestions'] as List<dynamic>? ?? [];
     return ParsedIngredient(
       rawName: json['rawName'] as String? ?? '',
+      rawLine: json['rawLine'] as String?,
       quantity: (json['quantity'] as num? ?? 0).toDouble(),
       unit: json['unit'] as String? ?? '',
       note: json['note'] as String?,

flutter/lib/features/recipes/domain/recipe_ingredient.dart

@@ -1,15 +1,19 @@
 class RecipeIngredient {
   final int id;
-  final int productId;
-  final String productName;
+  final int? productId;
+  final String? productName;
+  final String rawName;
+  final String? rawLine;
   final double quantity;
   final String unit;
   final String? note;
 
   const RecipeIngredient({
     required this.id,
-    required this.productId,
-    required this.productName,
+    this.productId,
+    this.productName,
+    required this.rawName,
+    this.rawLine,
     required this.quantity,
     required this.unit,
     this.note,
@@ -20,8 +24,10 @@ class RecipeIngredient {
     final rawQty = json['quantity'];
     return RecipeIngredient(
       id: (json['id'] as num).toInt(),
-      productId: (json['productId'] as num).toInt(),
-      productName: product?['name'] as String? ?? '',
+      productId: (json['productId'] as num?)?.toInt(),
+      productName: product?['canonicalName'] as String? ?? product?['name'] as String?,
+      rawName: json['rawName'] as String? ?? '',
+      rawLine: json['rawLine'] as String?,
       quantity: rawQty is num
           ? rawQty.toDouble()
           : double.tryParse(rawQty?.toString() ?? '') ?? 0,