Prompt serializer and test fixes

src/lib/nodes/ComfyGraphNode.ts

@@ -10,6 +10,7 @@ import { get } from "svelte/store";
 import configState from "$lib/stores/configState";
 import type { WritableLayoutStateStore } from "$lib/stores/layoutStates";
 import layoutStates from "$lib/stores/layoutStates";
+import workflowStateStore, { ComfyWorkflow } from "$lib/stores/workflowState";
 
 export type DefaultWidgetSpec = {
     defaultWidgetNode: new (name?: string) => ComfyWidgetNode,
@@ -106,6 +107,10 @@ export default class ComfyGraphNode extends LGraphNode {
         return layoutStates.getLayoutByNode(this);
     }
 
+    get workflow(): ComfyWorkflow | null {
+        return workflowStateStore.getWorkflowByNode(this);
+    }
+
     constructor(title?: string) {
         super(title)
         this.addProperty("tags", [], "array")