sealed commands

src/AppCommon/FileTime.App.Core.Abstraction/UserCommand/MoveCursorDownCommand.cs

@@ -1,6 +1,6 @@
 namespace FileTime.App.Core.UserCommand;
 
-public class MoveCursorDownCommand : IIdentifiableUserCommand
+public sealed class MoveCursorDownCommand : IIdentifiableUserCommand
 {
     public const string CommandName = "move_cursor_down";
     public static MoveCursorDownCommand Instance { get; } = new MoveCursorDownCommand();