Icon actions, dark-only theme, real media metadata

Five labelled buttons overflowed the episode row on a phone and the last one
collapsed into a one-letter-per-line column. They are icons now, each keeping
a contentDescription so the row reads the same to a screen reader as it did
with labels. Verified on the emulator against the real NPR feed: seven
episodes visible where four fitted before.

Dark only, not a dark default with a light alternative. This is a listening
app used in the dark -- in bed with a sleep timer running, or in a car -- so
the light theme is the one nobody would pick and it isn't built. The
unqualified resources carry the dark values too, otherwise the window flashes
white before Compose draws its first frame.

Media metadata was title-only, so the lock screen and any car head unit showed
blank lines where artist and album belong. It now carries the show as artist
and album, plus the artwork URI.

Seek increments are set on the player itself, which is what the notification,
lock screen, Bluetooth remote and car controls actually use -- they were
running on Media3's defaults, not the app's. Back 15, forward 25, and the
in-app bar now uses the same numbers so the two can never disagree about what
a skip does.

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

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