Add AlertBanner and turnActions to replace duplicated markup and
wrappers, and share component-test setup.
Fixes: oversized dismiss, help, rules and skip-link text after the type
ramp collapse; report button hover styled as submit; chat draft lost
when the panel folds; resign/claim/kick styles leaking app-wide.
Join/create latch and retry-on-refusal, the resume latch clearing on
noteRoom() and on noteResumeFailed() (both the explicit-error and the
time-box paths), quick-match queued-to-seated, and the held-action slot for
cancelQueue/leave/ready/start/kick — replace-not-queue semantics, retry on
refusal, and drop on teardown.
tiennm99