feat: add payment method

lib/models/closed_tab.dart

@@ -7,6 +7,7 @@ class ClosedTab {
   final String originalTabId;
   final String customerName;
   final DateTime closedAt;
+  final String paymentMethod;
   final List<ClosedTabItem> items;
 
   ClosedTab({
@@ -14,6 +15,7 @@ class ClosedTab {
     required this.originalTabId,
     required this.customerName,
     required this.closedAt,
+    required this.paymentMethod,
     required this.items,
   });
 
@@ -25,6 +27,14 @@ class ClosedTab {
   String get formattedTotal =>
       NumberFormat.simpleCurrency().format(totalInCents / 100);
 
+  String get formattedPaymentMethod {
+    return switch (paymentMethod) {
+      'cash' => 'Cash',
+      'payconiq' => 'Payconiq',
+      _ => 'Cash',
+    };
+  }
+
   @override
   bool operator ==(Object other) =>
       identical(this, other) ||
@@ -33,6 +43,7 @@ class ClosedTab {
           originalTabId == other.originalTabId &&
           customerName == other.customerName &&
           closedAt == other.closedAt &&
+          paymentMethod == other.paymentMethod &&
           _listEquals(items, other.items);
 
   @override
@@ -41,6 +52,7 @@ class ClosedTab {
         originalTabId,
         customerName,
         closedAt,
+        paymentMethod,
         Object.hashAll(items),
       );
 }
@@ -53,4 +65,4 @@ bool _listEquals<T>(List<T>? a, List<T>? b) {
     if (a[i] != b[i]) return false;
   }
   return true;
-}
+}