perf(highlight-stream): avoid full highlighted rebuild every frame - #483
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… events Completed line HTML is appended once as lines finalize. Each repaint still assembles highlighted from completed + preview so on:highlight stays current mid-line, without rebuilding the completed prefix from sealed DOM chunks. Adds a no-newline streaming e2e that asserts the event payload grows before done.
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Summary
highlightedstring (sealed prefix + tail) for thehighlightevent.donepass. Preview-only frames reuse the previous payload; split rendering still paints the live tail.Test plan
bun test tests/stream-highlighted.test.ts(append-only buffer + rematerialize policy)