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Address PR #209 review. - use-open-ai-chat.ts: call setWindowOpen(true) before awaiting getBoundChat so the header button feels instant on slow connections; the chat switch (setActiveChatId/setDraft/setSelectedRoleId) is applied after the round-trip resolves. Also drop the redundant no-op setWindowOpen(true) in the already-open branch (bare early return). - CHANGELOG.md: document the header AI-chat button auto-opening the latest chat bound to the current document under [Unreleased]/Added. Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>