Code Quality: Refactor Status Center code (#13276)

src/Files.App/App.xaml.cs

@@ -148,7 +148,7 @@ private IHost ConfigureHost()
 					.AddSingleton<SettingsViewModel>()
 					.AddSingleton<DrivesViewModel>()
 					.AddSingleton<NetworkDrivesViewModel>()
-					.AddSingleton<OngoingTasksViewModel>()
+					.AddSingleton<StatusCenterViewModel>()
 					.AddSingleton<AppearanceViewModel>()
 				).Build();
 		}
@@ -315,7 +315,7 @@ private async void Window_Closed(object sender, WindowEventArgs args)
 				UIHelpers.CloseAllDialogs();
 
 				// Close all notification banners except in progress
-				Ioc.Default.GetRequiredService<OngoingTasksViewModel>().CloseAllBanner();
+				Ioc.Default.GetRequiredService<StatusCenterViewModel>().RemoveAllCompletedItems();
 
 				// Cache the window instead of closing it
 				MainWindow.Instance.AppWindow.Hide();

src/Files.App/Converters/EnumToStringConverter.cs

@@ -0,0 +1,20 @@
+// Copyright (c) 2023 Files Community
+// Licensed under the MIT License. See the LICENSE.
+
+using Microsoft.UI.Xaml.Data;
+
+namespace Files.App.Converters
+{
+	internal sealed class EnumToStringConverter : IValueConverter
+	{
+		public object Convert(object value, Type targetType, object parameter, string language)
+		{
+			return value?.ToString() ?? string.Empty;
+		}
+
+		public object ConvertBack(object value, Type targetType, object parameter, string language)
+		{
+			throw new NotImplementedException();
+		}
+	}
+}