fix: clear combo widget value when removing image preview (#9323)

## Summary
The X button on image preview in VueNodes mode only cleared the stored
outputs but left the combo widget value intact, causing the old image to
persist across workflow runs and page refreshes.

## Screenshots (if applicable)
Before

https://github.com/user-attachments/assets/e2146ed1-5d79-41d6-946c-b30667ffac6a

After


https://github.com/user-attachments/assets/359b81fa-acc9-4711-9cee-62c230086f0c

┆Issue is synchronized with this [Notion
page](https://www.notion.so/PR-9323-fix-clear-combo-widget-value-when-removing-image-preview-3166d73d3650816db867eba49b8aeb6c)
by [Unito](https://www.unito.io)

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

@@ -243,7 +243,15 @@ const handleDownload = () => {
 
 const handleRemove = () => {
   if (!props.nodeId) return
+  const node = app.rootGraph?.getNodeById(Number(props.nodeId))
   nodeOutputStore.removeNodeOutputs(props.nodeId)
+  if (node) {
+    node.imgs = undefined
+    const imageWidget = node.widgets?.find((w) => w.name === 'image')
+    if (imageWidget) {
+      imageWidget.value = ''
+    }
+  }
 }
 
 const setCurrentIndex = (index: number) => {