feat: make cursor visible on exit

Commands/ExitCommand.cs

@@ -9,6 +9,7 @@ public class ExitCommand : ICommand
     public Task ExecuteAsync(string[] args, CancellationToken ct)
     {
         AnsiConsole.MarkupLine("[green]Goodbye![/]");
+        Console.CursorVisible = true;
         Environment.Exit(0);
         return Task.CompletedTask;
     }