Dealing with older browsers

[joepio]

A potential customer just noticed that the menu bar does not appear on her older S20 phone. I'm suspecting we might need to polyfill something...

Edit: yes, it's structuredclone.

• I think the solution is to do all sorts of polyfills. Doesn't vite already do this?
• Also, we need something like bugsnag to monitor stuff like this
• Can the menu be server-side rendered?
• We should probably show an error if JS fails for some reason