Desktop: give the host-key, delete and sign-out questions the keyboard on their harmless answer, and let Escape say no

src/DodoSSH.Client.App/Views/SignOutCard.axaml.cs

@@ -1,9 +1,15 @@
 using Avalonia.Controls;
+using DodoSSH.Client.Shell.ViewModels;
 
 namespace DodoSSH.Client.App.Views;
 
 /// <summary>The sign-out confirmation, shown on the preferences screen and on the unlock screen.</summary>
 internal sealed partial class SignOutCard : UserControl
 {
-    public SignOutCard() => InitializeComponent();
+    public SignOutCard()
+    {
+        InitializeComponent();
+
+        SafeAnswerFocus.Follow(this, nameof(MainWindowViewModel.IsConfirmingSignOut), () => CancelButton);
+    }
 }