DisclaimerUnofficial, and not affiliated with Anthropic. Nearly all of this is read straight out of what ships: npm bundles, captured prompts, published docs. Anthropic's own notes go in verbatim, marked as theirs. The rest is my reading, and every entry carries the strings behind it. If one looks wrong, vote it down and say why.
Transcript export now renders in chunks using a renderRange system, enabling streaming/progressive rendering of large transcripts instead of rendering everything at once.
Evidence
Chunked rendering via renderRange (search for "renderRange")
Strings lifted out of the shipped bundle, so the claim above can be checked against them.