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659c63e5ba
When the virtualization window slid during scroll, every visible row reconciled from scratch because the heavy chat-row subtree had no memo barriers, and because renderTranscriptItem rebuilt fresh branchAction / toolResult object literals each render that broke MessageBlock's existing memo. Wraps AssistantMessage, UserMessage, ToolCallBlock, ToolCallGroup, ToolResultBlock, and MarkdownRenderer in React.memo, and hoists the per-message branchAction and toolResult lookups into useMemo'd Maps keyed by message id. Window slides now keep referentially-stable props for unchanged rows, so reconciliation skips them and only newly entering rows pay full render cost. Tested: 722/722 desktop vitest suites pass Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>