Two collapser-card families (ClideHolderCard group container, T-266; the
ConversationCard merged tool card, T-262) attach collapse differently and
render inconsistent header chrome — status mark placement, no fixed
counter slot, color knob on one but not the other. File T-305 (under the
T-276 UI tracker) to extract one ClideCollapserCard primitive both grab:
a `color` for border/text fidelity, a fixed-width counter slot, and the
status icon hard against the card edge.
Adds the Frame0 wireframe (collapsed color variants + expanded nested
cards) at docs/design/wireframes/cards/collapser-card.{json,png}.
Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
