Clicking 'View Discography' on the Discover hero slideshow was calling
navigateToArtistDetail(id, name) without the third 'source' argument.
loadArtistDetailData then omits the `source` query param, so
/api/artist-detail falls through to a local DB lookup and returns 404
for artists that don't exist in the library — which is nearly every
hero artist, since they come from discover similar-artists.
Regression from the unification PR (93f1941) that rewrote the click
handler to route through the standalone /artist-detail page instead
of the old inline Artists view. The rewrite didn't thread the source.
Backend already includes `artist.source` on each hero entry. Fix:
- Stash artist.source as data-source on #discover-hero-discography
when displayDiscoverHeroArtist populates the card.
- Read data-source in viewDiscoverHeroDiscography and pass it as the
third arg to navigateToArtistDetail, so the eventual API call
includes `?source=itunes/deezer/etc.` and returns the synthesized
discography.
Reproduced by clicking View Discography on a non-Spotify hero artist
(log showed `GET /api/artist-detail/76258852?name=ДЕТИ+RAVE → 404,
Getting artist detail for ID: 76258852 (source=library)`).
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