improve parsing

lib/models/line_item.dart

@@ -1,6 +1,8 @@
 /// A parsed receipt row shown on the review screen.
 library;
 
+import 'receipt_bounds.dart';
+
 class LineItem {
   LineItem({
     required this.id,
@@ -9,6 +11,8 @@ class LineItem {
     this.quantity,
     this.unitPrice,
     this.discount = 0,
+    this.sourceBounds,
+    this.needsManualReview = false,
   });
 
   final String id;
@@ -22,6 +26,12 @@ class LineItem {
   /// Negative amount when a discount was folded into [price].
   final double discount;
 
+  /// Region on the receipt photo (normalized 0–1) used when parsing this line.
+  final ReceiptBounds? sourceBounds;
+
+  /// True when the parser could not confidently resolve price/qty for this line.
+  final bool needsManualReview;
+
   bool get hasDiscount => discount != 0;
 
   /// List price before a folded discount. Equals [price] when there is none.
@@ -37,7 +47,10 @@ class LineItem {
     int? quantity,
     double? unitPrice,
     double? discount,
+    ReceiptBounds? sourceBounds,
+    bool? needsManualReview,
     bool clearQuantity = false,
+    bool clearSourceBounds = false,
   }) {
     return LineItem(
       id: id ?? this.id,
@@ -46,6 +59,8 @@ class LineItem {
       quantity: clearQuantity ? null : (quantity ?? this.quantity),
       unitPrice: clearQuantity ? null : (unitPrice ?? this.unitPrice),
       discount: discount ?? this.discount,
+      sourceBounds: clearSourceBounds ? null : (sourceBounds ?? this.sourceBounds),
+      needsManualReview: needsManualReview ?? this.needsManualReview,
     );
   }
 }