fix(dashboard): bounded alarm drains, feed resubscribe, live pill, drop dead hub factory; doc corrections

src/ZB.MOM.WW.MxGateway.Tests/Gateway/Dashboard/DashboardHubsRegistrationTests.cs

@@ -27,23 +27,20 @@ public sealed class DashboardHubsRegistrationTests
             endpoint.Metadata.GetMetadata<IEndpointNameMetadata>()?.EndpointName == "DashboardHubToken");
     }
 
-    /// <summary>Verifies that dashboard build registers hub token service and connection factory.</summary>
+    /// <summary>
+    /// Verifies that dashboard build registers the hub token service. It is a singleton
+    /// shared by the <c>/hubs/token</c> endpoint and <c>HubTokenAuthenticationHandler</c>;
+    /// there is deliberately no client-side hub-connection factory to resolve, because
+    /// server-rendered pages read the in-process feeds instead of dialling their own hubs.
+    /// </summary>
     /// <returns>A task that represents the asynchronous operation.</returns>
     [Fact]
-    public async Task Build_WhenDashboardEnabled_RegistersHubTokenServiceAndConnectionFactory()
+    public async Task Build_WhenDashboardEnabled_RegistersHubTokenService()
     {
         await using WebApplication app = GatewayApplication.Build([]);
 
-        // HubTokenService is singleton; DashboardHubConnectionFactory is scoped
-        // (it captures NavigationManager and AuthenticationStateProvider which
-        // are themselves per-circuit).
         HubTokenService tokens = app.Services.GetRequiredService<HubTokenService>();
         Assert.NotNull(tokens);
-
-        using IServiceScope scope = app.Services.CreateScope();
-        DashboardHubConnectionFactory factory = scope.ServiceProvider
-            .GetRequiredService<DashboardHubConnectionFactory>();
-        Assert.NotNull(factory);
     }
 
     /// <summary>