Fix puffin_viewer build (#252)

### Checklist

* [X] I have read the [Contributor Guide](../CONTRIBUTING.md)
* [X] I have read and agree to the [Code of
Conduct](../CODE_OF_CONDUCT.md)
* [X] I have added a description of my changes and why I'd like them
included in the section below

### Description of Changes

This fix `puffin_viewer` build on `native linux` and `wasm32` target
arch

### Related Issues

This should fix the following error reported by CI in PR #249 :

https://github.com/EmbarkStudios/puffin/actions/runs/16790492466/job/47551014439?pr=249

Author: gwen-lg