Fix the sorting when adding mails.

Wino.Core.Domain/Interfaces/IMailListItemSorting.cs

@@ -0,0 +1,9 @@
+using System;
+
+namespace Wino.Core.Domain.Interfaces;
+
+public interface IMailListItemSorting
+{
+    DateTime SortingDate { get; }
+    string SortingName { get; }
+}

Wino.Core.Domain/Models/Comparers/ListItemComparer.cs

@@ -1,6 +1,7 @@
 using System;
 using System.Collections.Generic;
 using Wino.Core.Domain.Entities.Mail;
+using Wino.Core.Domain.Interfaces;
 
 public class ListItemComparer : IComparer<object>
 {
@@ -8,13 +9,14 @@ public class ListItemComparer : IComparer<object>
 
     public int Compare(object x, object y)
     {
-        if (x is MailCopy xMail && y is MailCopy yMail)
+        if (x is IMailListItemSorting xSorting && y is IMailListItemSorting ySorting)
+            return SortByName ? string.Compare(xSorting.SortingName, ySorting.SortingName, StringComparison.OrdinalIgnoreCase) : DateTime.Compare(xSorting.SortingDate, ySorting.SortingDate);
+        else if (x is MailCopy xMail && y is MailCopy yMail)
             return SortByName ? string.Compare(xMail.FromName, yMail.FromName, StringComparison.OrdinalIgnoreCase) : DateTime.Compare(yMail.CreationDate, xMail.CreationDate);
         else if (x is DateTime dateX && y is DateTime dateY)
             return DateTime.Compare(dateY, dateX);
         else if (x is string stringX && y is string stringY)
             return stringY.CompareTo(stringX);
-
         return 0;
     }
 }