refactor(adminui): explicit ClaimTypes.Role footer filter; fix stale NavSidebar comment

src/Server/ZB.MOM.WW.OtOpcUa.AdminUI/Components/Layout/MainLayout.razor

@@ -1,5 +1,5 @@
 @inherits LayoutComponentBase
-@using Microsoft.AspNetCore.Components.Routing
+@using System.Security.Claims
 
 @* Thin delegation to the shared ZB.MOM.WW.Theme side-rail chassis. ThemeShell owns
    the brand bar, the CSS-only narrow-viewport hamburger, and the responsive collapse,
@@ -38,7 +38,7 @@
                 <a class="rail-user" href="/account">@context.User.Identity?.Name</a>
                 <div class="rail-roles">
                     @string.Join(", ", context.User.Claims
-                        .Where(c => c.Type.EndsWith("/role")).Select(c => c.Value))
+                        .Where(c => c.Type == ClaimTypes.Role).Select(c => c.Value))
                 </div>
                 <form method="post" action="/auth/logout">
                     <AntiforgeryToken />