feat: add Message Flow Panel dev tool with translation boundary visualization#145

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teng-lin wants to merge 8 commits intomainfrom

worktree-message-ui

Commits on Feb 27, 2026

feat: add Message Flow Panel dev tool with adapter drop instrumentation
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feat: render thinking blocks during streaming and surface persisted output
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feat: add translation boundary visualization and fix build errors
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fix: coerce null traceColor to undefined for React CSSProperties compatibility
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feat: skip auto-launch when sessions exist; open new session dialog when none
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fix: correct message flow lane direction and remove chat UI pollution
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fix: update useMessageFlow test to match corrected lane direction mapping
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Commits on Feb 28, 2026

fix review: address gemini-code-assist feedback on PR #145
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