[backport cloud/1.39] feat: add hideOutputImages flag for nodes with custom preview (#8892)

Backport of #8857 to `cloud/1.39`

Automatically created by backport workflow.

┆Issue is synchronized with this [Notion
page](https://www.notion.so/PR-8892-backport-cloud-1-39-feat-add-hideOutputImages-flag-for-nodes-with-custom-preview-3086d73d365081f1b9c9eaa5a63c9c16)
by [Unito](https://www.unito.io)

Co-authored-by: Terry Jia <terryjia88@gmail.com>
Co-authored-by: Alexander Brown <drjkl@comfy.org>

src/renderer/extensions/vueNodes/components/LGraphNode.vue

@@ -567,7 +567,8 @@ const nodeMedia = computed(() => {
   const newOutputs = nodeOutputs.nodeOutputs[nodeOutputLocatorId.value]
   const node = lgraphNode.value
 
-  if (!node || !newOutputs?.images?.length) return undefined
+  if (!node || !newOutputs?.images?.length || node.hideOutputImages)
+    return undefined
 
   const urls = nodeOutputs.getNodeImageUrls(node)
   if (!urls?.length) return undefined

src/types/litegraph-augmentation.d.ts

@@ -177,6 +177,8 @@ declare module '@/lib/litegraph/src/litegraph' {
     isLoading?: boolean
     /** The content type of the node's preview media */
     previewMediaType?: 'image' | 'video' | 'audio' | 'model'
+    /** If true, output images are stored but not rendered below the node */
+    hideOutputImages?: boolean
 
     preview: string[]
     /** Index of the currently selected image on a multi-image node such as Preview Image */