Why: Approved redesign phase 4: process folds, long-reply folds, thinking
blocks and context-observation fold move to the @ui Collapsible primitive
(two-layer height+fade animation, delayed unmount, open-state memory);
tool calls render as ToolBlock rows with running sweep and paired results;
the live bar gains the ZCode worked-time line with sweep; input placeholder
states the backend's honest busy semantics (serialized per conversation).
Evidence: npx tsc -b clean; npm test -> 39 passed (details-guard included);
npm run build succeeds; combined make test recorded in the Dev task card.
Impact: Conversation.tsx replaces all <details> usage (guard-enforced);
ProcessParts pairs tool_call with its trailing tool_result into ToolBlock;
styles.css rewrites fold selectors for the Collapsible structure and adds
message mount animation (mk-rise-in); no contract or API changes.
Refs: Agent-System-Dev task feature/ui-tokens-v3 (phase 4).
weichen
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