fix: also update hash after inactivity

[dummdidumm]

closes #479 - beforeUnload was too late in my testing, and the use case is a real edge case anyway

[vercel]

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[Rich-Harris]

What if we updated it a) on body mouseleave and b) on Cmd-R or Ctrl-R keydown events? 5 seconds is a long time, and if it sometimes saves your work and sometimes doesn't it'll feel non-deterministic and unreliable

[Conduitry]

Is beforeUnload too late because we need to do async stuff during it to retrieve and encode all the REPL tabs? Or is it just too late because we can't change the URL hash anymore at that point? If it's only the latter, what about a very short-lived sessionStorage value that we read after the reload and perform the replaceState then?

[Rich-Harris]

merged #631 so will close this