feat: New Open Tab dialog with search and optional customer email. Drinks are now grouped per order. Payments trigger cha-ching and money rain.

lib/models/closed_tab_item.dart

@@ -7,6 +7,7 @@ class ClosedTabItem {
   final int unitPriceInCents;
   final DateTime? purchasedAt;
   final DateTime? removedAt;
+  final String? orderId;
 
   ClosedTabItem({
     required this.id,
@@ -17,6 +18,7 @@ class ClosedTabItem {
     required this.unitPriceInCents,
     this.purchasedAt,
     this.removedAt,
+    this.orderId,
   });
 
   bool get isRemoved => removedAt != null;
@@ -34,7 +36,8 @@ class ClosedTabItem {
           quantity == other.quantity &&
           unitPriceInCents == other.unitPriceInCents &&
           purchasedAt == other.purchasedAt &&
-          removedAt == other.removedAt;
+          removedAt == other.removedAt &&
+          orderId == other.orderId;
 
   @override
   int get hashCode => Object.hash(
@@ -46,5 +49,6 @@ class ClosedTabItem {
     unitPriceInCents,
     purchasedAt,
     removedAt,
+    orderId,
   );
 }