Adds a section at the bottom of the Artists overview listing artists you own
music by (LibraryItem) but don't follow (WatchedArtist), each with a Follow
action — so you can start monitoring artists already in your library.
- /api/artists GET now also returns `ownedNotFollowed`: distinct LibraryItem
artist names not matching the watched roster (case-insensitive; the known
have-via-scan name-match caveat, #18).
- Follow resolves the library name → MBID (/api/mb/artists) then POST /api/artists
with the canonical MB name (mirrors the Last.fm/discover follow flow); a
no-match surfaces a toast. Followed names hide immediately via a session set,
even if the MB canonical name differs from the library name.
web 153 tests (owned-not-followed + case-insensitive match asserted), tsc + build clean.
Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
Jonathan
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