fix(central-ui): resolve CentralUI-020..025 — auth-ping idle logout, DebugView race, push-handler disposal guard, JS-interop catch narrowing, claim-constant helper, SessionExpiry tests

tests/ScadaLink.CentralUI.Tests/Deployment/DeploymentsPushUpdateTests.cs

@@ -109,4 +109,48 @@ public class DeploymentsPushUpdateTests : BunitContext
         _deployRepo.DidNotReceive()
             .GetAllDeploymentRecordsAsync(Arg.Any<CancellationToken>());
     }
+
+    /// <summary>
+    /// Regression test for CentralUI-022. The notifier is a process singleton:
+    /// it can read its subscriber list and begin invoking
+    /// <c>OnDeploymentStatusChanged</c> on the DeploymentManager thread an
+    /// instant before the component is disposed. The handler must no-op against
+    /// a disposed component rather than letting <c>InvokeAsync</c> throw an
+    /// unobserved <see cref="ObjectDisposedException"/>.
+    /// </summary>
+    [Fact]
+    public void Deployments_HasDisposalGuardField()
+    {
+        var field = typeof(DeploymentsPage).GetField(
+            "_disposed", BindingFlags.Instance | BindingFlags.NonPublic);
+
+        Assert.NotNull(field);
+        Assert.Equal(typeof(bool), field!.FieldType);
+    }
+
+    [Fact]
+    public void Deployments_StatusChangeAfterDispose_DoesNotThrowOrReload()
+    {
+        RegisterServices();
+        var cut = Render<DeploymentsPage>();
+        var component = cut.Instance;
+
+        component.Dispose();
+        _deployRepo.ClearReceivedCalls();
+
+        // Simulate the race: the notifier captured the handler before the
+        // Dispose() unsubscribe and invokes it directly against the now-disposed
+        // component. Pre-fix this dispatched InvokeAsync against a dead circuit
+        // and threw ObjectDisposedException on a fire-and-forget task.
+        var handler = typeof(DeploymentsPage).GetMethod(
+            "OnDeploymentStatusChanged", BindingFlags.Instance | BindingFlags.NonPublic)!;
+
+        var ex = Record.Exception(() => handler.Invoke(component,
+            new object[] { new DeploymentStatusChange("dep-9", 1, DeploymentStatus.Success) }));
+
+        Assert.Null(ex);
+        // The guard short-circuits before any reload is attempted.
+        _deployRepo.DidNotReceive()
+            .GetAllDeploymentRecordsAsync(Arg.Any<CancellationToken>());
+    }
 }