Added authentication logic to app

ShopAdmin/Components/Pages/Login.razor

@@ -1,5 +1,7 @@
 @page "/login"
 @using Microsoft.AspNetCore.Components.Authorization
+@inject NavigationManager Navigation
+@rendermode InteractiveServer
 
 <div class="auth-workspace-canvas">
     <div class="tech-background-matrix">
@@ -67,8 +69,16 @@
     [CascadingParameter]
     private Task<AuthenticationState>? AuthState { get; set; }
 
-    private void HandleLogin()
+    protected override async Task OnInitializedAsync()
     {
-        // Wire up your OAuth / OpenID Connect Redirect or Auth trigger state here
+        if (AuthState is not null)
+        {
+            var state = await AuthState;
+
+            if (state.User.Identity?.IsAuthenticated ?? false) 
+                Navigation.NavigateTo("/", replace: true);
+        }
     }
+
+    private void HandleLogin() => Navigation.NavigateTo("/auth/login", forceLoad: true);
 }