Refactor serialization copying to use source generators (#19412)

Content.Client/Toggleable/ToggleableLightVisualsComponent.cs

@@ -10,7 +10,7 @@ namespace Content.Client.Toggleable;
 ///     visuals. This will modify the color of any attached point lights.
 /// </remarks>
 [RegisterComponent]
-public sealed class ToggleableLightVisualsComponent : Component
+public sealed partial class ToggleableLightVisualsComponent : Component
 {
     /// <summary>
     ///     Sprite layer that will have its visibility toggled when this item is toggled.
@@ -28,5 +28,5 @@ public sealed class ToggleableLightVisualsComponent : Component
     ///     Layers to add to the sprite of the player that is wearing this entity (while the component is toggled on).
     /// </summary>
     [DataField("clothingVisuals")]
-    public readonly Dictionary<string, List<PrototypeLayerData>> ClothingVisuals = new();
+    public Dictionary<string, List<PrototypeLayerData>> ClothingVisuals = new();
 }