Queen viewport contract: kanban at 1280x600 fails on main (card taller than the column box) #1572

The checks job is red on main and on every PR branch built on it, from the same step, Queen viewport contract:

main ce7aef777 (job 113761250243):
  1280x600 kanban   FAIL  NO WHOLE CARD IN A COLUMN running24 box 156px, first card 174px
PR #1567 c8dbcfec (job 113795305644):
  1280x600 kanban   FAIL  NO WHOLE CARD IN A COLUMN running27 box 156px, first card 159px

Every other size/view pair passes (19/20). The failing column and the card height change between runs (running24 -> running27, 174 -> 159 px), so the result depends on which live card lands first in a column: at 1280x600 a column box is 156 px, and any first card taller than that fails the contract.

It does not come from #1567, which touches no kanban code (blog, course spec, one widget).

Two honest fixes, owner to pick:

1. Layout: let the column at 600 px height fit one whole card (min height or clamp the card body), so the contract holds for any card.
2. Contract: render the viewport check from a fixed card fixture instead of live cards, so CI stops depending on today`s board.

The layout is hand-written CSS/JS in the Queen board, so under the t27-only rule this needs the owners owner-approved-foreign` label or a t27 home first.

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