fix: App mode - renaming widgets on subgraphs (#10245)

## Summary

Fixes renaming of widgets from subgraph nodes in app builder/app mode.

## Changes

- **What**: If the widget is from a subgraph node and no parents passed,
use the node as the subgraph parent.

┆Issue is synchronized with this [Notion
page](https://www.notion.so/PR-10245-fix-App-mode-renaming-widgets-on-subgraphs-3276d73d3650815bb131c840df43cdf2)
by [Unito](https://www.unito.io)

src/components/builder/AppModeWidgetList.vue

@@ -191,7 +191,11 @@ function nodeToNodeData(node: LGraphNode) {
         ]"
       >
         <template #button>
-          <Button variant="textonly" size="icon">
+          <Button
+            variant="textonly"
+            size="icon"
+            data-testid="widget-actions-menu"
+          >
             <i class="icon-[lucide--ellipsis]" />
           </Button>
         </template>