Remove old theme service completely.

Wino.Core.WinUI/Dialogs/CustomThemeBuilderDialog.xaml.cs

@@ -13,13 +13,13 @@ public sealed partial class CustomThemeBuilderDialog : ContentDialog
     public byte[] WallpaperData { get; private set; }
     public string AccentColor { get; private set; }
 
-    private IThemeService _themeService;
+    private INewThemeService _themeService;
 
     public CustomThemeBuilderDialog()
     {
         InitializeComponent();
 
-        _themeService = WinoApplication.Current.Services.GetService<IThemeService>();
+        _themeService = WinoApplication.Current.Services.GetService<INewThemeService>();
     }
 
     private async void ApplyClicked(ContentDialog sender, ContentDialogButtonClickEventArgs args)

Wino.Core.WinUI/Dialogs/NewAccountDialog.xaml.cs

@@ -1,9 +1,9 @@
 using System;
 using System.Collections.Generic;
 using System.Linq;
-using Windows.System;
 using Microsoft.UI.Xaml;
 using Microsoft.UI.Xaml.Controls;
+using Windows.System;
 using Wino.Core.Domain.Enums;
 using Wino.Core.Domain.Interfaces;
 using Wino.Core.Domain.Models.Accounts;
@@ -67,7 +67,7 @@ public sealed partial class NewAccountDialog : ContentDialog
     {
         InitializeComponent();
 
-        var themeService = WinoApplication.Current.ThemeService.GetAvailableAccountColors();
+        var themeService = WinoApplication.Current.NewThemeService.GetAvailableAccountColors();
         AvailableColors = themeService.Select(a => new AppColorViewModel(a)).ToList();
 
         UpdateSelectedColor();