fix: address code review findings

internal/scanner/scan.go

@@ -2,6 +2,7 @@ package scanner
 
 import (
 	"context"
+	"log"
 
 	"naviwatcher/internal/database"
 )
@@ -55,9 +56,12 @@ func ScanAll(ctx context.Context, db *database.DB, threshold float64) ([]Missing
 		if !s.Monitored {
 			continue
 		}
+		// A transient error for one artist must not abort the whole scan and
+		// take down the daemon; log it and continue with the remaining artists.
 		missing, err := ScanArtist(ctx, db, s.ID, resolved)
 		if err != nil {
-			return all, err
+			log.Printf("scan artist %s failed: %v", s.ID, err)
+			continue
 		}
 		all = append(all, missing...)
 	}

internal/scanner/scan_test.go

@@ -139,6 +139,35 @@ func TestScanArtist_RemasteredVariantNotMissing(t *testing.T) {
 	}
 }
 
+func TestScanArtist_YearTitledAlbumReissueReportedMissing(t *testing.T) {
+	db := newTestDB(t)
+	defer db.Close()
+
+	// Rush "2112" is a bare year-titled album; "2112 (Remastered)" is a
+	// distinct release group. Owning the standard 2112 must NOT count as owning
+	// the remastered reissue — the reissue should be reported missing.
+	seedArtist(t, db, "artist-1", "Rush")
+	seedLocalAlbum(t, db, "l1", "artist-1", "2112")
+	seedExternalRelease(t, db, "rg-standard", "artist-1", "2112", false)
+	seedExternalRelease(t, db, "rg-remaster", "artist-1", "2112 (Remastered)", false)
+
+	missing, err := ScanArtist(context.Background(), db, "artist-1", 0)
+	if err != nil {
+		t.Fatalf("ScanArtist() error: %v", err)
+	}
+
+	rgids := map[string]bool{}
+	for _, m := range missing {
+		rgids[m.RGID] = true
+	}
+	if rgids["rg-standard"] {
+		t.Errorf("standard 2112 should match local copy, not be missing")
+	}
+	if !rgids["rg-remaster"] {
+		t.Errorf("2112 (Remastered) reissue should be reported missing, got %v", rgids)
+	}
+}
+
 func TestScanArtist_CtxCancelled(t *testing.T) {
 	db := newTestDB(t)
 	defer db.Close()