Record the dashboard, and make the page capturable

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node scripts/record-dashboard.mjs drives the gateway with real requests and
screenshots the real dashboard between them with headless Chrome. Screen
recording was the obvious route and the wrong one: it would photograph whatever
else happened to be on screen and needs a permission grant. Headless captures
only the page, needs no permission, and writes frames straight to disk.

The dashboard never finished loading under a headless browser, because it holds
an SSE connection open and polls on an interval — so ?nolive=1 now renders once
and goes quiet. That also makes the page screenshot-testable in general.

Chrome does not reliably exit after --screenshot, so the recorder waits for the
PNG to appear and stop growing rather than guessing a sleep, and treats profile
cleanup as best-effort since Chrome keeps flushing after SIGKILL.

Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>

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