Set service worker timeout

[gfodor]

This adds a 5s timeout to the registration of the service worker completing. I thought I had all the relevant error handling in place, but it seems that in some cases the browser is not completing the promise for the registration, at all, when testing on a mobile device on a LAN. I am not positive what is going on, it seems related to the service worker loading over a slow LAN, but this timeout seems sane anyway (and the result is that the checkbox will just be hidden for notifications.)

[brianpeiris]

Seems reasonable. MDN docs do say that serviceWorker.ready never rejects and may "eventually" resolve. It's a bit unfortunate that we are potentially introducing a 5 second loading delay here.
May be nice to at least log a warning when the timeout happens.

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[johnshaughnessy]

Ah nice, I was going to ask about this. Had done something similar locally.