fix(ui): own private broadcast close-out dialog

KeepBroadcastDialog.xaml.cs

@@ -11,6 +11,8 @@ public partial class KeepBroadcastDialog : Window
     public KeepBroadcastDialog(string title)
     {
         InitializeComponent();
+        if (Application.Current?.MainWindow is { } owner && !ReferenceEquals(owner, this))
+            Owner = owner;
         MessageText.Text = string.IsNullOrWhiteSpace(title)
             ? "Your private broadcast is on YouTube as a private video. Keep it, or delete it?"
             : $"\u201c{title}\u201d is on YouTube as a private video. Keep it, or delete it?";

ytLive.Tests/TestStreamTests.cs

@@ -69,6 +69,45 @@ public sealed class TestStreamTests
         _app.Run(RunWindow);
     }
 
+    [Fact]
+    public void KeepBroadcastPrompt_IsOwnedAndReturnsControlToTheMainWindow()
+    {
+        _app.Run(RunKeepBroadcastPrompt);
+    }
+
+    private void RunKeepBroadcastPrompt()
+    {
+        var tempDb = Path.Combine(Path.GetTempPath(), $"ytLlive-test-{Guid.NewGuid():N}.db");
+        MainViewModel.LayoutPathOverride = tempDb;
+        MainWindow? window = null;
+        var previousMainWindow = Application.Current.MainWindow;
+        try
+        {
+            using (var schema = new LayoutStore(tempDb)) { }
+            SqliteConnection.ClearAllPools();
+
+            window = new MainWindow();
+            Application.Current.MainWindow = window;
+            window.Show();
+            window.UpdateLayout();
+
+            var dialog = new KeepBroadcastDialog("Test broadcast");
+            Assert.Same(window, dialog.Owner);
+            dialog.Loaded += (_, _) => dialog.DialogResult = true;
+            Assert.True(dialog.ShowDialog());
+            Assert.True(window.IsEnabled);
+            Assert.True(window.IsLoaded);
+        }
+        finally
+        {
+            if (window != null) window.Close();
+            Application.Current.MainWindow = previousMainWindow;
+            MainViewModel.LayoutPathOverride = null;
+            SqliteConnection.ClearAllPools();
+            try { File.Delete(tempDb); } catch { /* best-effort */ }
+        }
+    }
+
     private void RunCoordinator()
     {
         var handler = new RecordingHandler();
@@ -212,4 +251,4 @@ public sealed class TestStreamTests
             try { File.Delete(tempDb); } catch { /* best-effort cleanup */ }
         }
     }
-}
+}