The Fifth Column (and any feed added by URL) had NO coverUrl — the RSS
parser never captured channel artwork, so Now Playing had nothing to show.
- rss-parser: parseChannelCoverUrl (<itunes:image href> / RSS2 <image><url>);
parseRSSFeed sets it on the Podcast.
- feed store: fetchEpisodes returns the channel cover; subscribe + both
refresh paths backfill coverUrl when missing (no second fetch).
- useAudio + CLI --play: cover resolves feed.podcast.coverUrl ?? episode.imageUrl,
so episodes without channel art still get their own image.
- useAudio play/load/switchBackend: prefer the downloaded file
(getDownloadedFilePath) over the stream URL — downloaded episodes now
play from disk.
Verified: Fifth Column episode, cold cache -> cover-art-files set at load
-> albumart track present.
The cover was previously only wired through the UI hook; --play skipped it.
Also: Bun's fetch hangs in compiled binaries (Bun 1.3.8) — every cover
download silently failed in shipped builds, timing out against any host.
Cover staging now shells out to curl (present on macOS/Linux, 8s bound),
shared via src/utils/cover-art.ts so the UI and CLI paths stage the same
temp file and pass it to mpv as --cover-art-files (albumart track).
