Add .NET 8 templated projects.

Aaru.Server.New/Components/Account/IdentityRevalidatingAuthenticationStateProvider.cs

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+using System.Security.Claims;
+using Microsoft.AspNetCore.Components.Authorization;
+using Microsoft.AspNetCore.Components.Server;
+using Microsoft.AspNetCore.Identity;
+using Microsoft.Extensions.Options;
+using Aaru.Server.New.Data;
+
+namespace Aaru.Server.New.Components.Account;
+
+// This is a server-side AuthenticationStateProvider that revalidates the security stamp for the connected user
+// every 30 minutes an interactive circuit is connected.
+internal sealed class IdentityRevalidatingAuthenticationStateProvider
+    (ILoggerFactory loggerFactory, IServiceScopeFactory scopeFactory, IOptions<IdentityOptions> options)
+    : RevalidatingServerAuthenticationStateProvider(loggerFactory)
+{
+    protected override TimeSpan RevalidationInterval => TimeSpan.FromMinutes(30);
+
+    protected override async Task<bool> ValidateAuthenticationStateAsync(
+        AuthenticationState authenticationState, CancellationToken cancellationToken)
+    {
+        // Get the user manager from a new scope to ensure it fetches fresh data
+        await using var scope       = scopeFactory.CreateAsyncScope();
+        var             userManager = scope.ServiceProvider.GetRequiredService<UserManager<ApplicationUser>>();
+
+        return await ValidateSecurityStampAsync(userManager, authenticationState.User);
+    }
+
+    private async Task<bool> ValidateSecurityStampAsync(UserManager<ApplicationUser> userManager,
+                                                        ClaimsPrincipal              principal)
+    {
+        var user = await userManager.GetUserAsync(principal);
+
+        if(user is null)
+        {
+            return false;
+        }
+        else if(!userManager.SupportsUserSecurityStamp)
+        {
+            return true;
+        }
+        else
+        {
+            var principalStamp = principal.FindFirstValue(options.Value.ClaimsIdentity.SecurityStampClaimType);
+            var userStamp      = await userManager.GetSecurityStampAsync(user);
+
+            return principalStamp == userStamp;
+        }
+    }
+}