Default workflow subgraph attribute

src/lib/stores/workflowState.ts

@@ -57,6 +57,12 @@ export type WorkflowAttributes = {
      */
     queuePromptButtonRunWorkflow: boolean,
 
+    /*
+     * Default subgraph to run if `queuePromptButtonRunWorkflow` is `true`. Set
+     * to blank to run the default subgraph (tagless).
+     */
+    queuePromptButtonDefaultWorkflow: string,
+
     /*
      * If true, notifications will be shown when a prompt is queued and
      * completed. Set to false if you need more detailed control over the