Update icon assets

Ghost.Editor.Core/SceneGraph/EntityNode.cs

@@ -1,4 +1,6 @@
 using Ghost.Entities;
+using Microsoft.UI.Xaml;
+using Microsoft.UI.Xaml.Controls;
 
 namespace Ghost.Editor.Core.SceneGraph;
 
@@ -7,4 +9,37 @@ public sealed partial class EntityNode : SceneGraphNode
     private readonly Entity _entity;
 
     public Entity Entity => _entity;
+
+    public override IconSource? CreateIcon()
+    {
+        return new FontIconSource
+        {
+            Glyph = "\uF158"
+        };
+    }
+
+    public override UIElement? CreateHeader()
+    {
+        return null;
+    }
+
+    public override UIElement? CreateInspector()
+    {
+        throw new NotImplementedException();
+    }
+
+    public override DataTemplate GetSceneHierarchyTemplate()
+    {
+        var template = @"
+        <DataTemplate xmlns=""http://schemas.microsoft.com/winfx/2006/xaml/presentation"" xmlns:sg=""using:Ghost.Editor.Core.SceneGraph"" x:Key=""EntityTemplate"" x:DataType=""sg:SceneGraphNode"">
+            <TreeViewItem AutomationProperties.Name=""{x:Bind Name, Mode=OneWay}"" ItemsSource=""{x:Bind Children, Mode=OneWay}"">
+                <StackPanel Margin=""10,0"" Orientation=""Horizontal"">
+                    <FontIcon FontSize=""14"" Glyph=""&#xF158;"" />
+                    <TextBlock Margin=""5,0,0,0"" Text=""{x:Bind Name, Mode=OneWay}"" />
+                </StackPanel>
+            </TreeViewItem>
+        </DataTemplate>";
+
+        return (DataTemplate)Microsoft.UI.Xaml.Markup.XamlReader.Load(template);
+    }
 }