feat(ui): open ListSettingsModal via context menu and gear button

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

src/ClaudeDo.Ui/Views/Islands/ListsIslandView.axaml.cs

@@ -17,6 +17,14 @@ public partial class ListsIslandView : UserControl
             {
                 vm.FocusSearchRequested += (_, _) => SearchBox.Focus();
                 vm.ShowSettingsModal = ShowSettingsAsync;
+                vm.ShowListSettingsModal = async modal =>
+                {
+                    var window = new ListSettingsModalView { DataContext = modal };
+                    modal.CloseAction = () => window.Close();
+                    var top = TopLevel.GetTopLevel(this) as Window;
+                    if (top is null) window.Show();
+                    else await window.ShowDialog(top);
+                };
             }
         };
     }