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,

flutter/lib/features/recipes/presentation/create_recipe_screen.dart

@@ -191,7 +191,6 @@ class _CreateRecipeScreenState extends ConsumerState<CreateRecipeScreen> {
     for (var i = 0; i < _parsed!.ingredients.length; i++) {
       if (!_included[i]) continue;
       final productId = _selectedProductIds[i];
-      if (productId == null) continue;
       final qty = double.tryParse(
             _qtyControllers[i]!.text.trim().replaceAll(',', '.'),
           ) ??
@@ -207,9 +206,11 @@ class _CreateRecipeScreenState extends ConsumerState<CreateRecipeScreen> {
               .toList()
           : <int>[];
       ingredients.add({
-        'productId': productId,
-        'quantity': qty,
-        'unit': unit,
+        'rawName': ing.rawName,
+        if ((ing.rawLine ?? '').trim().isNotEmpty) 'rawLine': ing.rawLine,
+        if (productId != null) 'productId': productId,
+        if (qty > 0) 'quantity': qty,
+        if (unit.isNotEmpty) 'unit': unit,
         if (note.isNotEmpty) 'note': note,
         if (alternativeProductIds.isNotEmpty)
           'alternativeProductIds': alternativeProductIds,

flutter/lib/features/recipes/presentation/recipe_detail_screen.dart

@@ -396,6 +396,10 @@ class _RecipeBody extends StatelessWidget {
             const SizedBox(height: 12),
             ...recipe.ingredients.map((ing) {
               final qtyStr = ing.quantity == 0 ? '' : _fmtQty(ing.quantity);
+              final ingredientLabel = (ing.rawName.trim().isNotEmpty
+                      ? ing.rawName
+                      : (ing.productName ?? '').trim())
+                  .trim();
               final measureParts = [
                 if (qtyStr.isNotEmpty) qtyStr,
                 if (ing.unit.isNotEmpty) ing.unit,
@@ -430,8 +434,8 @@ class _RecipeBody extends StatelessWidget {
                     Expanded(
                       child: Text(
                         ing.note != null
-                            ? '${ing.productName} (${ing.note})'
-                            : ing.productName,
+                            ? '$ingredientLabel (${ing.note})'
+                            : ingredientLabel,
                         style: theme.textTheme.bodyMedium,
                       ),
                     ),