Navigator detection would work incorrectly in Node 22+

Node 22 has global `navigator` object, so this check should be updated accordingly

```
var inBrowser = typeof navigator !== 'undefined';
```

Related links
https://github.com/nodejs/node/issues/39540
https://nodejs.org/docs/latest/api/globals.html#navigatoruseragent
```
console.log(`The user-agent is ${navigator.userAgent}`); // Prints "Node.js/21" 
```
