Tuned defaults: retry disabled (we throw typed errors), 30s staleTime
to make tab-switch re-navigation feel instant, no refetchOnWindowFocus
(users on a music app don't expect spurious network when they tab back).
Wraps fetch, parses JSON, and throws ApiError{code,message,status}
on non-2xx. Degrades to {code:'unknown'} when the error body is not
the expected envelope shape.
bvandeusen