perf(flowchat): Keep long thinking lightweight - #3204
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Use Markstream for thinking Markdown while preserving the response renderer and existing safe HTML, math, image, and navigation behavior. Reuse unchanged parsed trees so settled thinking blocks skip renders. Remove thinking arrival fading because its full-document DOM scans cause frame drops on long streams. Keep thinking code fences as plain source permanently, including Mermaid and completed/reopened content, to avoid bulk highlighting stalls. Preserve line numbers and copying. Document both restrictions to prevent reintroducing these costs. Remove temporary performance probes after runtime verification. Validation: 105 focused tests, check:web, ESLint, and diff checks pass.
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Use Markstream for thinking Markdown while preserving the response
renderer and existing safe HTML, math, image, and navigation behavior.
Reuse unchanged parsed trees so settled thinking blocks skip renders.
Remove thinking arrival fading because its full-document DOM scans
cause frame drops on long streams. Keep thinking code fences as plain
source permanently, including Mermaid and completed/reopened content,
to avoid bulk highlighting stalls. Preserve line numbers and copying.
Document both restrictions to prevent reintroducing these costs.