fix: node shape not reactive in vueNodes mode (#7302)

## Summary

add node shape support in vueNodes

fix https://github.com/Comfy-Org/ComfyUI_frontend/issues/7144

## Screenshots (if applicable)


https://github.com/user-attachments/assets/df8a4fa6-5686-435d-a814-4fe3990f7e69

┆Issue is synchronized with this [Notion
page](https://www.notion.so/PR-7302-fix-node-shape-not-reactive-in-vueNodes-mode-2c56d73d3650811c9ef5e4fe49c94f55)
by [Unito](https://www.unito.io)

---------

Co-authored-by: github-actions <github-actions@github.com>

src/lib/litegraph/src/LGraphNode.ts

@@ -495,6 +495,7 @@ export class LGraphNode
   }
 
   set shape(v: RenderShape | 'default' | 'box' | 'round' | 'circle' | 'card') {
+    const oldValue = this._shape
     switch (v) {
       case 'default':
         this._shape = undefined
@@ -514,6 +515,14 @@ export class LGraphNode
       default:
         this._shape = v
     }
+    if (oldValue !== this._shape) {
+      this.graph?.trigger('node:property:changed', {
+        nodeId: this.id,
+        property: 'shape',
+        oldValue,
+        newValue: this._shape
+      })
+    }
   }
 
   /**