The home-card refresh test runs keepHomeCardsFresh in a synctest bubble,
so its waits are exact on a fake clock instead of 15-second polls.
The geo fallback subtest in which geojs never answers used a 50 ms time
limit and counted requests at the fake server, which a slow host could
miss. It now uses a transport that counts each request as it is sent and
holds it until the time limit ends it.
Model: opus-5-5
sneak