Refactor activation handling and introduce entity system

Added new `ActivationHandler` class for folder initialization.
Added `ProjectService` class for project-related operations.
Added `Ghost.Entities` project with entity management classes.
Added `EngineEditorWindow` for enhanced user interface.

Changed project files to restructure dependencies and remove unused references.
Changed `ProjectRepository` to use asynchronous methods for improved performance.
Changed data binding in `CreateProjectPage.xaml` and `OpenProjectPage.xaml` to use new data models.
Changed `App.xaml.cs` to utilize the new `ActivationHandler` and include additional services.

Removed `IActivationHandler` interface and integrated its functionality into `ActivationHandler`.
Removed `EditorActivationHandler` as its functionality was merged into `ActivationHandler`.

Updated `AssemblyInfo.cs` to include global using directives for entity types.
Updated image assets to reflect visual resource changes.

Ghost.Editor/View/Pages/Landing/OpenProjectPage.xaml.cs

@@ -1,7 +1,8 @@
-using Ghost.Database.DataContext;
-using Ghost.Database.Models.Projects;
+using Ghost.Data.Models;
+using Ghost.Data.Services;
 using Microsoft.UI.Xaml;
 using Microsoft.UI.Xaml.Controls;
+using Microsoft.UI.Xaml.Navigation;
 using System.Collections.ObjectModel;
 
 // To learn more about WinUI, the WinUI project structure,
@@ -11,17 +12,24 @@ namespace Ghost.Editor.View.Pages.Landing;
 
 internal sealed partial class OpenProjectPage : Page
 {
+    private readonly ProjectService _projectService;
+
     public readonly ObservableCollection<ProjectInfo> projects = new();
 
     public OpenProjectPage()
     {
-        foreach (var project in ProjectRepository.LoadProjects())
+        _projectService = App.GetService<ProjectService>();
+
+        InitializeComponent();
+    }
+
+    protected override async void OnNavigatedTo(NavigationEventArgs e)
+    {
+        await foreach (var project in _projectService.LoadProjectAsync())
         {
             projects.Add(project);
         }
 
-        InitializeComponent();
-
         if (projects.Count == 0)
         {
             PlaceHolderText.Visibility = Visibility.Visible;