Give the application a settings area built from what really exists

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

@@ -0,0 +1,29 @@
+using Avalonia.Controls;
+using Avalonia.Input;
+using DodoSSH.Client.Shell.ViewModels;
+
+namespace DodoSSH.Client.App.Views;
+
+/// <summary>Vaults, restyled into the settings page idiom — see the remark at the top of the markup.</summary>
+internal sealed partial class SettingsVaultsPage : UserControl
+{
+    public SettingsVaultsPage() => InitializeComponent();
+
+    private MainWindowViewModel? Shell => DataContext as MainWindowViewModel;
+
+    /// <remarks>
+    /// Only a press on the wash itself, the same test <c>QuickConnect.OnBackdropPressed</c> makes: a press
+    /// inside the card bubbles through here too, with its source the control that was actually hit rather
+    /// than the backdrop, so closing on those would make the panel impossible to click into.
+    /// </remarks>
+    private void OnBackdropPressed(object? sender, PointerPressedEventArgs e)
+    {
+        if (!ReferenceEquals(e.Source, MembersBackdrop) || Shell is not { } shell)
+        {
+            return;
+        }
+
+        shell.Vaults.CloseMembersPanelCommand.Execute(null);
+        e.Handled = true;
+    }
+}