Refactor serialization copying to use source generators (#19412)

Content.Client/Light/Visualizers/PoweredLightVisualsComponent.cs

@@ -5,14 +5,14 @@ namespace Content.Client.Light.Visualizers;
 
 [RegisterComponent]
 [Access(typeof(PoweredLightVisualizerSystem))]
-public sealed class PoweredLightVisualsComponent : Component
+public sealed partial class PoweredLightVisualsComponent : Component
 {
     /// <summary>
     /// A map of the sprite states used by this visualizer indexed by the light state they correspond to.
     /// </summary>
     [DataField("spriteStateMap")]
     [ViewVariables(VVAccess.ReadOnly)]
-    public readonly Dictionary<PoweredLightState, string> SpriteStateMap = new()
+    public Dictionary<PoweredLightState, string> SpriteStateMap = new()
     {
         [PoweredLightState.Empty] = "empty",
         [PoweredLightState.Off] = "off",