The selection mechanism of Tabulator was getting in the way of having nice
navigation, as it would deselect (i.e. nav to "/") before selecting the
next job (i.e. nav to "/jobs/{job-id}").
The active job is now determined by the URL and thus handled by Vue Router.
Clicking on a job simply navigates to its URL, which causes the reactive
system to load & display it.
It is still intended to get job selection for "mass actions", but that's
only possible after normal navigation is working well.
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