Fix linked asset widget promotion in vue (#7895)

Asset widgets resolve the list of models by checking the name of the
node the widget is contained on. When an asset widget is linked to a
subgraph node, a clone is made of the widget and then the clone is used
to initialize an asset widget in vue mode. Since the widget no longer
holds any form of reference to the original node, asset data fails to
resolve.

This is fixed by storing the original nodeType as an option on the
cloned widget when an asset widget is linked to a subgraph input.

| Before | After |
| ------ | ----- |
| <img width="360" alt="before"
src="https://github.com/user-attachments/assets/345f9cc1-da04-44ab-8fed-76379c8528de"/>
| <img width="360" alt="after"
src="https://github.com/user-attachments/assets/88d1ddaa-56fb-41b3-8d5d-0ded02aaa7d2"
/>|

See also #7563, #7560

┆Issue is synchronized with this [Notion
page](https://www.notion.so/PR-7895-Fix-linked-asset-widget-promotion-in-vue-2e26d73d365081e5b295f6236458b978)
by [Unito](https://www.unito.io)

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
 }