test(playwright): align E2E nav tests with current NavMenu

The role-navigation and navigation E2E tests asserted on a stale nav model —
labels 'Data Connections', 'Instances', 'Areas' that NavMenu.razor no longer
uses, 'Connections' mapped to /admin instead of /design, and Event Logs /
Parked Messages treated as all-roles when they are Deployment-role gated.
SitesPage_ShowsTable expected an HTML <table> but Sites.razor renders site
cards. Corrected the expectations to the actual NavMenu/Sites markup; the
role-based authorization itself was already correct. Suite: 43/43.

tests/ScadaLink.CentralUI.PlaywrightTests/NavigationTests.cs

@@ -25,9 +25,9 @@ public class NavigationTests
 
     [Theory]
     [InlineData("Sites", "/admin/sites")]
-    [InlineData("Connections", "/admin/connections")]
     [InlineData("API Keys", "/admin/api-keys")]
     [InlineData("LDAP Mappings", "/admin/ldap-mappings")]
+    [InlineData("SMTP Configuration", "/admin/smtp")]
     public async Task AdminNavLinks_NavigateCorrectly(string linkText, string expectedPath)
     {
         var page = await _fixture.NewAuthenticatedPageAsync();
@@ -37,6 +37,7 @@ public class NavigationTests
     [Theory]
     [InlineData("Templates", "/design/templates")]
     [InlineData("Shared Scripts", "/design/shared-scripts")]
+    [InlineData("Connections", "/design/connections")]
     [InlineData("External Systems", "/design/external-systems")]
     public async Task DesignNavLinks_NavigateCorrectly(string linkText, string expectedPath)
     {