Add MainService for state management and update Index and AuthDialog to utilize it

src/FrontOffice.Main/Shared/AuthDialog.razor.cs

@@ -231,7 +231,10 @@ public partial class AuthDialog : IDisposable
                 {
                     MudDialog?.Close();
                 }
+                
                 await OnLoginSuccess.InvokeAsync();
+                await InvokeAsync(StateHasChanged);
+                MainService.OnOnChangeHandler();
                 // await OnLoginSuccessAsync();
                 return true;
             }