refactor(server/m7-353): consolidate findSidecarCover into coverart package

internal/subsonic/stream.go

@@ -15,6 +15,7 @@ import (
 	"github.com/jackc/pgx/v5"
 	"github.com/jackc/pgx/v5/pgxpool"
 
+	"git.fabledsword.com/bvandeusen/minstrel/internal/coverart"
 	"git.fabledsword.com/bvandeusen/minstrel/internal/db/dbq"
 	"git.fabledsword.com/bvandeusen/minstrel/internal/playevents"
 )
@@ -143,28 +144,7 @@ func resolveAlbumCoverPath(ctx context.Context, q *dbq.Queries, album dbq.Album)
 	if err != nil || len(tracks) == 0 {
 		return ""
 	}
-	return findSidecarCover(tracks[0].FilePath)
-}
-
-// sidecarNames are the conventional names for album art living next to audio
-// files. Order matches how most library tools write them — cover.* wins over
-// folder.*, and JPEG wins over PNG when both are present.
-var sidecarNames = []string{
-	"cover.jpg", "cover.jpeg", "cover.png",
-	"folder.jpg", "folder.jpeg", "folder.png",
-}
-
-// findSidecarCover looks for a cover image in the directory containing the
-// given track file. Returns "" if no sidecar exists.
-func findSidecarCover(trackPath string) string {
-	dir := filepath.Dir(trackPath)
-	for _, name := range sidecarNames {
-		candidate := filepath.Join(dir, name)
-		if info, err := os.Stat(candidate); err == nil && !info.IsDir() {
-			return candidate
-		}
-	}
-	return ""
+	return coverart.FindSidecar(filepath.Dir(tracks[0].FilePath))
 }
 
 func serveImage(w http.ResponseWriter, r *http.Request, path string) {