refactor(centralui): migrate Move/Rename/Compose dialogs to DialogService.ShowAsync host (T33b)

tests/ZB.MOM.WW.ScadaBridge.CentralUI.Tests/DataConnectionsPageTests.cs

@@ -250,13 +250,21 @@ public class DataConnectionsPageTests : BunitContext
             },
             connections: new[] { new DataConnection("PLC-1", "OpcUa", 1) { Id = 100 } });
 
+        // T33b: the move dialog is now opened via IDialogService.ShowAsync and rendered
+        // by the shared DialogHost (which lives in MainLayout in production). Render a
+        // host in the same DI scope so the dialog the page opens is displayed; the host's
+        // focus-trap JS interop runs as no-ops under loose mode.
+        JSInterop.Mode = JSRuntimeMode.Loose;
+        var host = Render<DialogHost>();
+
         var cut = Render<DataConnectionsPage>();
         FindToggleForLabel(cut, "Plant-A")!.Click();
 
         cut.FindAll("button").First(b => b.TextContent.Contains("Move to Site")).Click();
+        host.Render();
 
         // The dialog renders with a site picker; the current site is excluded.
-        var dialog = cut.Find(".modal.show");
+        var dialog = host.Find(".modal.show");
         var optionLabels = dialog.QuerySelectorAll("select option")
             .Select(o => o.TextContent).ToList();
         Assert.Contains(optionLabels, l => l.Contains("Plant-B"));