build(frontend): rebuild static/ on the merged tip (#2656)
One build on the tip after merging dev, per the branch'"'"'s standing rule
that intermediate commits carry a stale bundle and only the tip has to be
right.
dev'"'"'s CSS moved to index-Db2rfQf-.css while this branch was out; the
rebuild lands on the same hash, so static/index.html differs from dev by
the script line alone again.