Add artwork, a real player screen, and queue drag-reorder

Closes three of the four Phase 1 gaps in CLAUDE.md's "Known gaps": artwork was
parsed and passed to the lock screen but never rendered, playback had a
transport bar with no scrubbing or per-show speed, and QueueOrdering.move was
tested but unreachable from any screen. Android Auto real-car verification
stays deferred, per Peter's call.

- Artwork: new Artwork.preferredUrl (episode image falling back to the show's),
  resolved once at EpisodeEntity.toMediaItem's MediaMetadata boundary so the
  lock screen, Android Auto, the now-playing bar and the new player screen all
  read it from one place. Coil3 wired to the app's own OkHttpClient. Pinned to
  3.3.0: later releases require a newer Kotlin stdlib or Compose than this
  project runs (Compose 1.12 needs compileSdk 37, one above what AGP 8.13.2
  supports).
- Player screen: scrubbing (PlayerConnection.seekTo, committed on drag release)
  and per-show speed (PlayerViewModel.setShowSpeed persists
  SubscriptionEntity.playbackSpeed via a new SubscriptionDao.updateSpeed) --
  the field existed since Phase 1 with nothing to reach it. Opened by tapping
  the now-playing bar's title/artwork; Up Next moved to its own icon there.
- Queue reorder: drag-and-drop via sh.calvin.reorderable, backed by a new
  QueueRepository.reorder that writes the final order once on drag release
  rather than per drag step (the gesture reports intermediate positions
  continuously).

Coverage baseline drop (62.10% -> 61.15%) is entirely in already-0%-covered
Media3 glue -- see COVERAGE_EXCEPTION. The new pure logic (Artwork,
QueueRepository.reorder) is fully covered by new tests.

Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01Sj3CoWEedM56bebByKgNxA

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