字体图标配置无效

### Describe the bug

官网自己的例子，打开图标在codesandbox都不显示啊

### Your Example Website or App

https://graphin.antv.vision/~demos/element-node-icon

### Steps to Reproduce the Bug or Issue

直接打开官方例子

### Expected behavior

显示相应的图标

### Screenshots or Videos

_No response_

### Platform

- OS:macOS
- Browser: Chrome
- Version:

### Additional context

_No response_

Open the official element-node-icon demo at https://graphin.antv.vision/~demos/element-node-icon in Chrome and reproduce the missing icons in CodeSandbox. Trace the demo's font-icon configuration and compare it with how the example loads its assets. Done means the corresponding icons render in the official example and CodeSandbox.

Written by the indexing model from the issue text.