feat(central-ui): link Health outbox tiles to the Notification KPIs page

src/ScadaLink.CentralUI/Components/Pages/Monitoring/Health.razor

@@ -21,7 +21,10 @@
     </div>
 
     @* Notification Outbox headline KPIs — a central concern, shown regardless of site reports *@
-    <h6 class="text-muted mb-2">Notification Outbox</h6>
+    <div class="d-flex justify-content-between align-items-center mb-2">
+        <h6 class="text-muted mb-0">Notification Outbox</h6>
+        <a class="small" href="/notifications/kpis">View details &rarr;</a>
+    </div>
     <div class="row g-3 mb-3">
         <div class="col-lg-4 col-md-6 col-12">
             <div class="card h-100">

tests/ScadaLink.CentralUI.Tests/Pages/HealthPageTests.cs

@@ -84,6 +84,13 @@ public class HealthPageTests : BunitContext
         });
     }
 
+    [Fact]
+    public void RendersLinkToTheNotificationKpisPage()
+    {
+        var cut = Render<HealthPage>();
+        Assert.Contains("/notifications/kpis", cut.Markup);
+    }
+
     [Fact]
     public void OutboxKpiFailure_ShowsGracefulFallback()
     {