The goal strip and the queue dock ride directly above the input card, and
both create a stacking context (`isolation: isolate`) so their frosted
panel stays behind their own content. A tooltip bubble left inside that
context resolves its z-index there, where the card — painted later in the
same context — wins: the goal strip's bubble showed a two-pixel sliver
and the queue dock's stayed entirely hidden.
Portal those dock tooltips to the body, where the bubble's z-index
resolves above the whole card. The ui-primitives `portal` contract now
names the capping stacking context beside clipped containers, because
neither container clips its bubble.
The queue-actions aria goldens lose the tooltip line: the captured center
column no longer contains the portaled bubble. The scenario still covers
it by role and adds a hit test at the bubble's center and bottom edge, as
does goal-bar.
Turtle
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