riverpod-async-gap treated any site that read an AsyncValue as a UI read,
including ref.listen. A listener mirrors the value into a side effect and
draws nothing, so it cannot leave a blank or stale screen. Dogfooding on
word_alive flagged an analytics user-property listener this way.
A gap now needs a ref.watch that reads the value. Listeners still count as
places that handle error or loading.
