At 601px the select columns were squeezed to 89/103/113px while the selects
are floored at 120px, so each control overran its neighbour (row scrollWidth
603 vs 569 clientWidth). Hold the same floor on the column, letting the
search field absorb the shrink instead.
The plugins panel had the same viewport-drift the drawer had: leaving the
mobile band left `filtersOpen` true, so `aria-expanded` stayed "true" on the
hidden toggle. Reset it from the same media query.
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