[backport core/1.36] Fix linked asset widget promotion in vue (#8002)

Backport of #7895 to `core/1.36`

Automatically created by backport workflow.

┆Issue is synchronized with this [Notion
page](https://www.notion.so/PR-8002-backport-core-1-36-Fix-linked-asset-widget-promotion-in-vue-2e76d73d365081609fa6d09552938bb9)
by [Unito](https://www.unito.io)

Co-authored-by: AustinMroz <austin@comfy.org>

src/lib/litegraph/src/subgraph/SubgraphNode.ts

@@ -28,6 +28,7 @@ import type {
 } from '@/lib/litegraph/src/types/serialisation'
 import type { IBaseWidget } from '@/lib/litegraph/src/types/widgets'
 import type { UUID } from '@/lib/litegraph/src/utils/uuid'
+import { AssetWidget } from '@/lib/litegraph/src/widgets/AssetWidget'
 import { toConcreteWidget } from '@/lib/litegraph/src/widgets/widgetMap'
 
 import { ExecutableNodeDTO } from './ExecutableNodeDTO'
@@ -333,6 +334,8 @@ export class SubgraphNode extends LGraphNode implements BaseLGraph {
     const promotedWidget = toConcreteWidget(widget, this).createCopyForNode(
       this
     )
+    if (widget instanceof AssetWidget)
+      promotedWidget.options.nodeType ??= widget.node.type
 
     Object.assign(promotedWidget, {
       get name() {

src/lib/litegraph/src/types/widgets.ts

@@ -27,6 +27,8 @@ export interface IWidgetOptions<TValues = unknown[]> {
   socketless?: boolean
   /** If `true`, the widget will not be rendered by the Vue renderer. */
   canvasOnly?: boolean
+  /** Used as a temporary override for determining the asset type in vue mode*/
+  nodeType?: string
 
   values?: TValues
   /** Optional function to format values for display (e.g., hash → human-readable name) */

src/renderer/extensions/vueNodes/widgets/components/WidgetSelectDropdown.vue

@@ -60,8 +60,9 @@ const combinedProps = computed(() => ({
 }))
 
 const getAssetData = () => {
-  if (props.isAssetMode && props.nodeType) {
-    return useAssetWidgetData(toRef(() => props.nodeType))
+  const nodeType = props.widget.options?.nodeType ?? props.nodeType
+  if (props.isAssetMode && nodeType) {
+    return useAssetWidgetData(toRef(nodeType))
   }
   return null
 }