User's empirical fix: on a 1280-class viewport (sidebar 220, content
~1010), --app-min 300 made the grid pick 3 cols because
floor((1010+20)/(300+20)) = 3, which left a 4-card category landing
as 3+1 with the orphan-row gap that's been the running visual
complaint. Bumping --app-min to 328 changes the floor to
floor((1010+20)/(328+20)) = 2, so the same 4-card category becomes
2+2 with no orphan.
Wider monitors are unaffected — a 1056px content area still fits 3
tracks of 328 (3*328 + 2*20 = 1024 ≤ 1056), and 1700px+ content
still fits 4. The cards-per-row count only drops on the narrow band
where 300 would otherwise have squeezed a third just-too-tight
column in.
Signed-off-by: librelad <librelad@digitalangels.vip>