Asset URLs are not content-hashed, so the cache-first strategy pinned
whatever bytes were first cached and never noticed a redeployed file
changed — leaving stale weather-gl.js/output.css in place until a manual
CACHE_VERSION bump. Only a hard reload (which bypasses the SW) showed the
new assets. Switch /static/ to network-first (fall back to cache offline)
and bump CACHE_VERSION v4->v5 to flush the stale shell.
e0d90ff7cc