Every artist on a multi-artist track now gets credit for the play.
- Featured and collab artists count toward top artists, totals and their own artist page (#25)
- Flow splits a collab play evenly between its artists, so the streams still add up to your real listening
- Track rows link each artist separately instead of only the first one
Artists are only split when Navidrome lists them separately, so a single tag like "A, B" still counts as one artist.