4 sortable columns: Date, Worker, Amount, Status. Click cycles
desc -> asc -> desc. Click a different column -> resets to desc.
Keyboard Enter / Space also works (role=button + tabindex=0).
The sort/order state lives in hidden inputs inside the adjustments
filter form, so the JS just mutates those and .submit()s — the sort
then piggy-backs on the same GET the filter bar uses, and the URL
retains it across pagination. Backend sort_map (Task 3) already
whitelists the allowed columns, so no SQL-injection surface.
Arrow icons reflect state: fa-sort (inactive), fa-sort-down (desc),
fa-sort-up (asc). Active column gets .sorted class for stronger
arrow opacity (CSS already shipped in Task 2).
No backend changes, no new tests — the existing 65 tests cover the
sort contract from the URL.
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