Attempt to bring back ListView.

Wino.Mail.ViewModels/Data/IMailListItem.cs

@@ -0,0 +1,25 @@
+using System;
+using Wino.Core.Domain.Interfaces;
+
+namespace Wino.Mail.ViewModels.Data;
+
+/// <summary>
+/// Common interface for mail items that can be displayed in a mail list.
+/// Implemented by both MailItemViewModel and ThreadMailItemViewModel.
+/// </summary>
+public interface IMailListItem : IMailHashContainer
+{
+    /// <summary>
+    /// Gets the latest creation date for sorting purposes.
+    /// For MailItemViewModel: the mail's creation date
+    /// For ThreadMailItemViewModel: the latest email's creation date
+    /// </summary>
+    DateTime CreationDate { get; }
+
+    /// <summary>
+    /// Gets the sender's name for grouping purposes.
+    /// For MailItemViewModel: the mail's from name
+    /// For ThreadMailItemViewModel: the latest email's from name
+    /// </summary>
+    string FromName { get; }
+}