Playback controls, background workers, settings

The app can now actually play something. A MediaController binds the UI to the
playback service rather than reaching for the ExoPlayer instance directly --
the service can restart independently of the activity, and a stale direct
reference would fail with no obvious symptom. Resume goes through
PlaybackProgress, so an episode whose stored position is past a re-encoded end
restarts rather than seeking past the end and stalling.

Skip is asymmetric: 15 seconds back for a missed sentence, 30 forward for an
ad break.

Workers: refresh every six hours on unmetered network only -- refreshing feeds
is cheap but the downloads that follow are not, and a phone on mobile data
should not discover that by itself -- and retention every twelve. Both enqueue
with KEEP rather than UPDATE, since UPDATE resets the interval on every launch
and on a frequently-opened app means periodic work effectively never fires.

Retention's actual logic is in RetentionSweeper rather than the Worker,
because it deletes a listener's audio and the failure mode is silent and
permanent. It only clears the database row once the file is really gone: the
other order orphans the file, since nothing else knows about it and the disk
would never be reclaimed. A row pointing at an already-missing file is still
cleared, or it stays a permanently unplayable DOWNLOADED entry.

Settings reaches the three features that had tested logic and no way to run
them: OPML import and export through the system file picker, playback speed,
and the sleep timer. Import reports how many feeds failed, not just how many
succeeded -- silently importing 40 of 60 only surfaces weeks later when a show
never appears.

ListenViewModel was split rather than raising detekt's function-count limit a
second time. Playback controls operate on whatever is playing regardless of
screen, which is a real seam rather than a count.

Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_018AwnALZL6bD4VBtATDVv3B

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