fix(artwork): never settle absent for a kind no recheck job revisits

The 12h retry budget hands a bare failure to the periodic stale-absent
sweep, which is what makes the resulting absent row recoverable. Media
files are deliberately excluded from that sweep -- they resolve embedded
only, at scan or on view -- so exhausting the budget on a transient read
error recorded a "this track has no cover" verdict that nothing would
ever revisit.

Settle absent only for kinds a recheck job covers. Without a row the
track stays unresolved, so the next view re-enqueues it.

core/artwork/housekeeping.go

@@ -5,6 +5,7 @@ import (
 	"crypto/md5"
 	"encoding/hex"
 	"fmt"
+	"slices"
 	"time"
 
 	"github.com/navidrome/navidrome/conf"
@@ -23,6 +24,13 @@ var recheckKinds = []model.Kind{
 	model.KindArtistArtwork, model.KindAlbumArtwork, model.KindPlaylistArtwork, model.KindRadioArtwork,
 }
 
+// hasRecheckPath reports whether a periodic job will revisit this kind, which is what makes
+// settling absent on an exhausted retry budget recoverable rather than permanent.
+func hasRecheckPath(prefix string) bool {
+	kind, ok := model.ParseKind(prefix)
+	return ok && slices.Contains(recheckKinds, kind)
+}
+
 // artworkEpoch invalidates all resolution state when bumped; bump it in the same change that
 // alters resolution semantics. Deliberately not the server version, which changes every build.
 const artworkEpoch = 1

core/artwork/worker.go

@@ -273,11 +273,11 @@ func (w *Worker) process(ctx context.Context, item model.ArtworkQueueItem) (outc
 			}
 			break
 		}
-		// Retry budget exhausted: stop retrying. A bare failure settles absent so the stale-absent
-		// sweep (and a page view) can still recover it; a stale-found keeps its already-served art.
-		// Art we are already serving is kept too: exhaustion means the source stayed unreachable,
-		// not that the entity lost its cover.
-		if out == outcomeFailed && !w.hasResolvedArtwork(ctx, item) {
+		// Retry budget exhausted: stop retrying. Absent is only recoverable where a periodic
+		// recheck will revisit it, so kinds without one keep no row at all; and art already
+		// being served is kept, since exhaustion means the source stayed unreachable rather
+		// than that the entity lost its cover.
+		if out == outcomeFailed && hasRecheckPath(item.ItemKind) && !w.hasResolvedArtwork(ctx, item) {
 			writeAbsent(ctx, w.deps.ds.Artwork(ctx), item)
 		}
 		if err := queue.DeleteIfUnchanged(item.ItemKind, item.ItemID, item.ImageType, item.RetryAt); err != nil {

core/artwork/worker_test.go

@@ -364,6 +364,32 @@ var _ = Describe("Worker", func() {
 			Expect(ia.Hash).To(Equal("cafebabe"), "a persistent outage must not discard served art")
 		})
 
+		// Media files are excluded from recheckKinds, so an absent row written here would never
+		// be revisited: a transient read error would look like "this track has no cover" forever.
+		It("does not settle absent on exhaustion for a kind with no recheck path", func() {
+			conf.Server.EnableMediaFileCoverArt = true
+			ds.MockedMediaFile = tests.CreateMockMediaFileRepo()
+			ds.MockedMediaFile.(*tests.MockMediaFileRepo).SetData(model.MediaFiles{
+				{ID: "mfX", LibraryID: 0, Path: "tests/fixtures/artist/an-album/gone.mp3", HasCoverArt: true},
+			})
+			Expect(queueRepo.Enqueue(model.ArtworkQueueItem{ItemKind: "mf", ItemID: "mfX"})).To(Succeed())
+			for k, v := range queueRepo.Data {
+				if v.ItemID == "mfX" {
+					v.EnqueuedAt = time.Now().Add(-(giveUpAfter + time.Hour))
+					queueRepo.Data[k] = v
+				}
+			}
+
+			n, err := w.drain(ctx, 1)
+			Expect(err).ToNot(HaveOccurred())
+			Expect(n).To(Equal(1))
+
+			Expect(findQueued(queueRepo, "mf", "mfX")).To(BeNil(), "the row must stop retrying")
+			_, err = artRepo.GetItemArtwork(model.KindMediaFileArtwork, "mfX", model.ImageTypePrimary)
+			Expect(err).To(MatchError(model.ErrNotFound),
+				"no row leaves the track unresolved, so a later view can still recover it")
+		})
+
 		It("resolves a private playlist under an admin context instead of failing forever", func() {
 			ds.MockedUser = adminUserRepo()
 			vds := &visibilityPlaylistDS{