Complete management API and CLI command parity

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

@@ -1,3 +1,4 @@
+using Microsoft.JSInterop;
 using System.Security.Claims;
 using ZB.MOM.WW.ScadaBridge.Security;
 using Bunit;
@@ -20,6 +21,13 @@ namespace ZB.MOM.WW.ScadaBridge.CentralUI.Tests;
 /// </summary>
 public class DataConnectionsPageTests : BunitContext
 {
+    [Fact]
+    public void StorageSaveFixture_CompletesInvocationImmediately()
+    {
+        var invocation = JSInterop.JSRuntime.InvokeVoidAsync("treeviewStorage.save", "fixture-probe", "[]");
+        Assert.True(invocation.IsCompletedSuccessfully, "The storage-save fixture must complete JS calls before component disposal.");
+    }
+
     private readonly ISiteRepository _siteRepo = Substitute.For<ISiteRepository>();
     // M9-T25: the design page now injects IConnectionHealthQueryService to render
     // per-connection live health badges. A substitute defaulting to an empty map
@@ -51,7 +59,7 @@ public class DataConnectionsPageTests : BunitContext
                 new Dictionary<int, ConnectionHealth>()));
 
         JSInterop.Setup<string?>("treeviewStorage.load", _ => true).SetResult(null);
-        JSInterop.SetupVoid("treeviewStorage.save", _ => true);
+        JSInterop.SetupVoid("treeviewStorage.save", _ => true).SetVoidResult();
     }
 
     private void AddTestAuth()