Extracts a shared ClideHolderCard primitive (consumed next by T-264) that
renders a folded run as one framed container wrapping its sub-cards:
- The whole holder background is the collapse toggle — a gesture target
behind the children that only fires for hits the children don't consume.
Each sub-card opaquely absorbs its own bounds, so a card tap (and its
copy button) interacts with the card, never the holder; selection drags
pass through. This ends the scroll race: while a run tail-follows, a
click on whatever background is in view collapses it, no top header to
reach.
- A focusable caret keeps the control keyboard/AT reachable (D-78); the
collapsed ticker + step count are preserved.
- _ActivityCard becomes a thin stateless adopter of the primitive.
Tests: ticker/expand, background-toggle, child-tap-not-hijacked, copy
still works, keyboard Activate path; golden for collapsed + expanded.
Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
jpmschweitzerandClaude Opus 4.8
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