GitHub code view fails to load when content contains non-ASCII characters

Related threads:

* https://github.com/orgs/community/discussions/188156 ("[2026-02-27] Incident Thread")

* https://github.com/orgs/community/discussions/188151 ("Having trouble finding & showing repository's wiki page with non-ASCII page title")

* https://github.com/orgs/community/discussions/188152 ("Broken UI and 404 to files and directories with non-ASCII names")