Upgrade Dexie.js

[MisRob]

We currently use Dexie.js v3.0.2 together with Dexie.Observable add-on v3.0.0-beta.9.

It'd be good to upgrade to Dexie.js v3.2.0 at least because a new reactivity system has been available since this release which now offers better integration with Vue components and is also said to have better performance:

NOTE: For a long time, we’ve had an add-on, Dexie.Observable.js that could be used to gain reactivity but to the cost of both complexity and performance. And it had nothing to do with Observables as in Ecmascript proposal for Observable or RxJS observables — and it has not entered a stable state yet, but hopefully, it will not be as useful anymore as we will have liveQuery built-in instead.

[MisRob]

I'll try to upgrade to v3.2.0 when working on #3364 because it'd be handy for that work. It seems that v3.2.0 should allow us to use the new reactivity system with liveQuery whenever we need it while not breaking parts of the app built around the old Dexie.Observable. I'll also use #3364 as an opportunity to confirm that using liveQuery in some places in a way that's compatible with our current approach is really possible.

[MisRob]

Closed by #3393