test / unit + widget + golden + a11y (push) Failing after 24s
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The Claude pane's conversation view hand-rolled a separate card layout per message kind (user/assistant/thinking/tool-use/tool-result), so any shared chrome had to be added five times. ConversationCard is one template with three variants (stripe/bordered/bare) that wires the chrome once: a copy button revealed on hover (yielding the turn's raw text), an always-visible collapse/expand caret for collapsible turns, and an extensible MessageAction list. It's decoupled from ConversationItem — the view maps each item to (variant, accent, label, body, copyText, actions) — so the typed event cards coming with the stream-json work reuse the same chrome with a different body. T-173. Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>