This file is deliberately framework-free — no React, no build step, no stylesheet from the
widget. It loads the assistant with the single <script> tag at the bottom
of this document, exactly as a client site would.
Open it with a site token whose allowed domains include this host:
/demo-embed.html?site_token=st_… (create one with
pnpm site create in apps/api). The colour, side
and greeting come from that site's configuration.