fix(centralui): single relay toast, paging/skip polish, extra Site Calls tests

tests/ScadaLink.CentralUI.PlaywrightTests/ScadaLink.CentralUI.PlaywrightTests.csproj

@@ -15,6 +15,13 @@
     <PackageReference Include="Microsoft.Playwright" />
     <PackageReference Include="xunit" />
     <PackageReference Include="xunit.runner.visualstudio" />
+    <!--
+      SkippableFact lets the Site Calls E2E tests report as Skipped (not Failed)
+      when the dev cluster / MSSQL is not running. xunit 2.9.x does not ship
+      Assert.Skip / SkipUnless — those are v3-only — so we use the canonical
+      community wrapper, matching ScadaLink.ConfigurationDatabase.Tests.
+    -->
+    <PackageReference Include="Xunit.SkippableFact" />
   </ItemGroup>
 
   <ItemGroup>