fix(centralui): pending-updates rail refreshes as soon as a deployment finishes — cache drops its snapshot on Success/Failed and signals the indicator, instead of serving the pre-deploy count for up to TTL + one poll

tests/ZB.MOM.WW.ScadaBridge.CentralUI.Tests/Layout/PendingUpdatesIndicatorTests.cs

@@ -126,6 +126,26 @@ public class PendingUpdatesIndicatorTests : BunitContext
         return host.FindComponent<PendingUpdatesIndicator>();
     }
 
+    /// <summary>
+    /// Verifies that the rail re-reads as soon as the cache reports it was invalidated (a
+    /// deployment finished), rather than waiting out its 30 s poll: after a successful Deploy
+    /// all the old count used to linger for up to the cache TTL plus one poll interval.
+    /// </summary>
+    [Fact]
+    public void CacheInvalidated_RereadsWithoutWaitingForThePoll()
+    {
+        var cache = Substitute.For<IPendingUpdatesCache>();
+        cache.GetAsync(Arg.Any<bool>(), Arg.Any<CancellationToken>()).Returns(
+            Task.FromResult(Snapshot(SiteRow(1, staleInstances: 9))),
+            Task.FromResult(Snapshot(SiteRow(1, staleInstances: 0))));
+        var cut = RenderFor(cache, Role(Roles.Deployer));
+        cut.WaitForAssertion(() => Assert.Contains("9 instances", cut.Markup));
+
+        cache.Invalidated += Raise.Event<Action>();
+
+        cut.WaitForAssertion(() => Assert.Contains("Up to date", cut.Markup), TimeSpan.FromSeconds(5));
+    }
+
     /// <summary>Verifies that a user with only the Viewer role sees no pending-updates indicator.</summary>
     [Fact]
     public void Viewer_RendersNothing()