Adopted further C# 14 and .NET 10 features (#1158)

app/MindWork AI Studio/Layout/MainLayout.razor.cs

@@ -69,7 +69,7 @@ public partial class MainLayout : LayoutComponentBase, IMessageBusReceiver, ILan
     
     private ILanguagePlugin Lang { get; set; } = PluginFactory.BaseLanguage;
 
-    private FileExportNotifications FileExportNotifications => this.fileExportNotifications ??= new(this.Snackbar);
+    private FileExportNotifications FileExportNotifications => field ??= new(this.Snackbar);
 
     private string PaddingLeft => this.navBarOpen ? $"padding-left: {NAVBAR_EXPANDED_WIDTH_INT - NAVBAR_COLLAPSED_WIDTH_INT}em;" : "padding-left: 0em;";
     
@@ -85,7 +85,6 @@ public partial class MainLayout : LayoutComponentBase, IMessageBusReceiver, ILan
     private bool useDarkMode;
     private bool startupCompleted;
     private bool settingsWriteProtectionWarningShown;
-    private FileExportNotifications? fileExportNotifications;
     private readonly SemaphoreSlim mandatoryInfoDialogSemaphore = new(1, 1);
     private readonly SemaphoreSlim promptInjectionDialogSemaphore = new(1, 1);
     private readonly SemaphoreSlim dataRestorePendingDialogSemaphore = new(1, 1);