chore(examples): only use bundle

examples/nextjs/pages/Subflow/DebugNode.tsx

@@ -1,6 +1,6 @@
 import React, { memo, FC, CSSProperties } from 'react';
 
-import { Handle, NodeProps, Position } from '@react-flow/core';
+import { Handle, NodeProps, Position } from '@react-flow/bundle';
 
 const infoStyle: CSSProperties = { fontSize: 11 };
 const idStyle: CSSProperties = {
@@ -14,12 +14,12 @@ const idStyle: CSSProperties = {
 const DebugNode: FC<NodeProps> = ({ zIndex, xPos, yPos, id }) => {
   return (
     <>
-      <Handle type='target' position={Position.Top} />
+      <Handle type="target" position={Position.Top} />
       <div style={idStyle}>{id}</div>
       <div style={infoStyle}>
         x:{Math.round(xPos || 0)} y:{Math.round(yPos || 0)} z:{zIndex}
       </div>
-      <Handle type='source' position={Position.Bottom} />
+      <Handle type="source" position={Position.Bottom} />
     </>
   );
 };