Three code-review fixes:
1. Pagination links were building ?status=...&page=2&page=3 on every
click because the template appended &page= onto an already-
serialised querystring. Added a reusable url_replace template tag
that replaces a single key (pre-empts Tasks 5 / 9 which also
need it) and piped the pagination hrefs through it. Added
rel=prev/next + aria-label on the <a> tags while we were here.
2. Filter-bar labels had no for= attribute, so screen readers
announced the native <select> with no name. Added id= on each
select/input and matching for= on each label. Also gave the
Select-all checkbox an aria-label (title= alone is not an
accessible name).
3. Row template's {% with team=adj.worker.teams.first %} issued a
fresh ORDER BY ... LIMIT 1 query per row despite the view's
prefetch_related('worker__teams'). Swapped to {% with
teams=adj.worker.teams.all %} which DOES use the prefetch cache,
bounding the Team column at 0 extra queries (was ~50 per page).
06b3315641