[wip]fix: use svelte component for optionsWidget

frontend/src/wasm-communication/messages.ts

@@ -4,6 +4,7 @@ import { Transform, Type, plainToClass } from "class-transformer";
 
 import { type IconName, type IconSize } from "@graphite/utility-functions/icons";
 import { type WasmEditorInstance, type WasmRawInstance } from "@graphite/wasm-communication/editor";
+import WidgetLayout from "~src/components/widgets/WidgetLayout.svelte";
 
 export class JsMessage {
 	// The marker provides a way to check if an object is a sub-class constructor for a jsMessage.
@@ -932,7 +933,8 @@ export class PopoverButton extends WidgetProps {
 	@Transform(({ value }: { value: string }) => value || undefined)
 	tooltip!: string | undefined;
 
-    options_widget: WidgetLayout | undefined;
+    optionsWidget: WidgetLayout = defaultWidgetLayout();
+    layoutTarget: unknown = undefined;
 }
 
 export type RadioEntryData = {