feat: add alot

lib/models/tab_item.dart

@@ -1,5 +1,6 @@
+import 'package:flutter/foundation.dart';
+
 import 'tab_item_purchase.dart';
-import '../utils/collection_utils.dart';
 
 class TabItem {
   final String id;
@@ -22,14 +23,6 @@ class TabItem {
 
   int get lineTotalInCents => quantity * unitPriceInCents;
 
-  String get formattedLineTotal {
-    return '€${(lineTotalInCents / 100).toStringAsFixed(2)}';
-  }
-
-  String get formattedUnitPrice {
-    return '€${(unitPriceInCents / 100).toStringAsFixed(2)}';
-  }
-
   @override
   bool operator ==(Object other) =>
       identical(this, other) ||