### Description
Implements mobile data streaming confirmation (allow once/always
notification) in Media3PlaybackService, matching the legacy
PlaybackService behavior. Includes pre-Oreo PendingIntent compatibility,
stale notification cleanup on new media load, and a streaming guard for
queue auto-advance.
Fixes#8301
### Checklist
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Co-authored-by: ByteHamster <info@bytehamster.com>
Feed downloads are now independent from episode downloads.
This makes it easier to use WorkManager for refreshing.
Also, it will make it easier to add different refresh intervals
in the future.
