- Action cluster's max-width is calc(48*3 + 4*2) so the 6 icons
always lay out as 3 top / 3 bottom by default.
- When the pane narrows the chips in col 1 shrink first (with 60px
min so 4 chars + ellipsis stay visible).
- At <380px the cluster snaps to absolute overlay with a left-edge
box-shadow so it reads as floating above the truncated chip.