The terminal and logs carried a 7.5rem minHeight, so dragging the seam down
jammed against a floor with a sliver of unusable terminal still showing.
Tool-panel zones now floor at COLLAPSED_ZONE_PX (the h-7 header strip)
instead of the generic 80px, and releasing at that floor minimizes the zone
rather than persisting the sliver — it folds to its collapsed header,
vertical rail or horizontal strip depending on the parent axis. The sliver
size is never written, so restoring returns the height it had before.
Brooklyn Nicholson
aca571ef49