Implement a legacy canvas widget for vue mode (#6011)

![updated-legacy-widget](https://github.com/user-attachments/assets/3f0a1623-9445-4059-acbb-086baec54980)

┆Issue is synchronized with this [Notion
page](https://www.notion.so/PR-6011-Implement-a-legacy-canvas-widget-for-vue-mode-2896d73d36508127a5d1debcccb519a0)
by [Unito](https://www.unito.io)

---------

Co-authored-by: GitHub Action <action@github.com>

src/lib/litegraph/src/LGraphCanvas.ts

@@ -2801,7 +2801,7 @@ export class LGraphCanvas
     // Widget
     const widget = node.getWidgetOnPos(x, y)
     if (widget) {
-      this.#processWidgetClick(e, node, widget)
+      this.processWidgetClick(e, node, widget)
       this.node_widget = [node, widget]
     } else {
       // Node background
@@ -2981,13 +2981,12 @@ export class LGraphCanvas
     this.dirty_canvas = true
   }
 
-  #processWidgetClick(
+  processWidgetClick(
     e: CanvasPointerEvent,
     node: LGraphNode,
-    widget: IBaseWidget
+    widget: IBaseWidget,
+    pointer = this.pointer
   ) {
-    const { pointer } = this
-
     // Custom widget - CanvasPointer
     if (typeof widget.onPointerDown === 'function') {
       const handled = widget.onPointerDown(pointer, node, this)