F1: StreamingPlainText/PlainChunk render untrusted model reasoning as a React
text node (escaped), NOT via innerHTML — the load-bearing security property. The
existing tests asserted via textContent, which strips tags, so they couldn't
tell an escaped literal from injected DOM: a future switch to
dangerouslySetInnerHTML would reintroduce XSS with zero failing tests. Add a test
feeding an <img onerror> + <b> payload and asserting querySelector("img"/"b") is
null AND the raw markup survives in textContent — non-vacuous (fails if the
string were parsed as HTML).
F2: the .reasoningText CSS note still described the removed <Text> pre-wrap
fallback and pointed at reasoning-block.tsx (both stale), while PlainChunk's JSDoc
points back to this note — a broken mutual reference. Update the note to point at
PlainChunk / streaming-plain-text.tsx, where pre-wrap is now applied.
No production rendering logic changed. vitest: 8 passed.
Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
claude code agent 227
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