Subject: Update name variable assignment in CascadeAuthState.razor

Body:
Updated the assignment of the `name` variable in `CascadeAuthState.razor` to prevent potential `NullReferenceException`. The new code uses the null-conditional operator to check if the user has a claim of type "name". If not, it assigns an empty string to `name` using the null-coalescing operator, ensuring `name` is always assigned a string value.

Author: Sntai20

WebApp/Components/Pages/User/CascadeAuthState.razor

@@ -20,7 +20,7 @@
 
             if (user?.Identity is not null && user.Identity.IsAuthenticated)
             {
-                var name = user.FindFirst("name").Value;
+                string name = user.FindFirst("name")?.Value ?? string.Empty;
                 if (user.IsInRole("Admin"))
                 {
                     authMessage = $"{name} is authenticated and in the Admin role.";