Add host activity and DB browser, and keep dialogs, drag-drop, and idle maintenance responsive.

Co-authored-by: Cursor <cursoragent@cursor.com>

src/Explorer.App/ModelessWindowClose.cs

@@ -0,0 +1,23 @@
+using System.Windows;
+using System.Windows.Input;
+
+namespace Explorer.App;
+
+/// <summary>
+/// Close helpers for windows opened with <see cref="Window.Show"/>.
+/// <see cref="Button.IsCancel"/> sets <see cref="Window.DialogResult"/>, which throws on modeless windows.
+/// </summary>
+internal static class ModelessWindowClose
+{
+    public static void EnableEscape(Window window)
+        => window.PreviewKeyDown += (_, e) =>
+        {
+            if (e.Key != Key.Escape)
+            {
+                return;
+            }
+
+            window.Close();
+            e.Handled = true;
+        };
+}