localStorageOutbox — default storage adapter: the whole queue as one JSON
value in localStorage. SSR-safe: when localStorage is unavailable,
load() returns null and save()/clear() are no-ops (with a console
warning on save failure, e.g. quota exceeded).
localStorageOutbox — default storage adapter: the whole queue as one JSON value in
localStorage. SSR-safe: whenlocalStorageis unavailable,load()returns null andsave()/clear()are no-ops (with a console warning on save failure, e.g. quota exceeded).