EstadoRadio.emisoraActual only ever reflected in-memory state
(_emisoraSeleccionada or the live audio service), so stopping playback
and reopening the app left the Escuchar hero empty even though the
user had a station selected right before closing it.
Persist the station whenever it changes (reproducir(), and the
Android-Auto out-of-band reconciliation path) and restore it as
_emisoraSeleccionada on the next cold start, only when nothing is
already selected. This never touches the audio service directly: no
playback starts and estadoStream/estaSonando stay at their stopped
default, matching how every consumer already gates "is it playing" on
the playback-status stream rather than on emisoraActual itself.
FreeTLab
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