服务端渲染报错 `window is not defined`,

服务端渲染时报错：

版本:@chatui/core@2.4.2

报错信息：
ReferenceError: window is not defined

报错文件：
```
node_modules/@chatui/core/lib/utils/canUse.js:30:30

26 | smoothScroll: function smoothScroll() {
27 | return 'scrollBehavior' in document.documentElement.style;
28 | },
29 | touch: function touch() {
> 30 | return 'ontouchstart' in window;
| ^
31 | }
32 | };
33 |
```

Start with node_modules/@chatui/core/lib/utils/canUse.js at line 30 and reproduce the server-side rendering failure described in the issue. Trace how this utility is reached during SSR; done means server rendering no longer raises ReferenceError: window is not defined.

Written by the indexing model from the issue text.