fix: use Inventory API condition enum strings (NEW/USED_VERY_GOOD etc) not numeric IDs

EbayListingTool/Models/ListingDraft.cs

@@ -1,4 +1,4 @@
-using System.ComponentModel;
+using System.ComponentModel;
 using System.Runtime.CompilerServices;
 
 namespace EbayListingTool.Models;
@@ -150,12 +150,12 @@ public class ListingDraft : INotifyPropertyChanged
 
     public string ConditionId => Condition switch
     {
-        ItemCondition.New => "1000",
-        ItemCondition.OpenBox => "1500",
-        ItemCondition.Refurbished => "2500",
-        ItemCondition.Used => "3000",
-        ItemCondition.ForPartsOrNotWorking => "7000",
-        _ => "3000"
+        ItemCondition.New => "NEW",
+        ItemCondition.OpenBox => "LIKE_NEW",
+        ItemCondition.Refurbished => "SELLER_REFURBISHED",
+        ItemCondition.Used => "USED_VERY_GOOD",
+        ItemCondition.ForPartsOrNotWorking => "FOR_PARTS_OR_NOT_WORKING",
+        _ => "USED_VERY_GOOD"
     };
 
     public event PropertyChangedEventHandler? PropertyChanged;