fix mask editor bug under vueNodes (#5953)

## Summary

fix mask editor issues on vueNodes

┆Issue is synchronized with this [Notion
page](https://www.notion.so/PR-5953-fix-mask-editor-bug-under-vueNodes-2856d73d3650810aa8a2e1a94c4d97a6)
by [Unito](https://www.unito.io)

src/scripts/app.ts

@@ -380,11 +380,15 @@ export class ComfyApp {
     const paintedIndex = selectedIndex + 1
     const combinedIndex = selectedIndex + 2
 
+    // for vueNodes mode
+    const images =
+      node.images ?? useNodeOutputStore().getNodeOutputs(node)?.images
+
     ComfyApp.clipspace = {
       widgets: widgets,
       imgs: imgs,
       original_imgs: orig_imgs,
-      images: node.images,
+      images: images,
       selectedIndex: selectedIndex,
       img_paste_mode: 'selected', // reset to default im_paste_mode state on copy action
       paintedIndex: paintedIndex,
@@ -411,7 +415,8 @@ export class ComfyApp {
           ComfyApp.clipspace.imgs[ComfyApp.clipspace.combinedIndex].src
       }
       if (ComfyApp.clipspace.imgs && node.imgs) {
-        if (node.images && ComfyApp.clipspace.images) {
+        // Update node.images even if it's initially undefined (vueNodes mode)
+        if (ComfyApp.clipspace.images) {
           if (ComfyApp.clipspace['img_paste_mode'] == 'selected') {
             node.images = [
               ComfyApp.clipspace.images[ComfyApp.clipspace['selectedIndex']]
@@ -513,6 +518,8 @@ export class ComfyApp {
       }
 
       app.graph.setDirtyCanvas(true)
+
+      useNodeOutputStore().updateNodeImages(node)
     }
   }