fix: address code review findings

internal/scanner/scan.go

@@ -28,7 +28,7 @@ func ScanArtist(ctx context.Context, db *database.DB, artistID string, threshold
 		return nil, err
 	}
 
-	missing := FindMissingReleases(local, external, resolveThreshold(threshold))
+	missing := FindMissingReleases(local, external, threshold)
 	return missing, nil
 }
 
@@ -46,8 +46,6 @@ func ScanAll(ctx context.Context, db *database.DB, threshold float64) ([]Missing
 		return nil, err
 	}
 
-	resolved := resolveThreshold(threshold)
-
 	var all []MissingRelease
 	for _, s := range settings {
 		if err := ctx.Err(); err != nil {
@@ -58,7 +56,7 @@ func ScanAll(ctx context.Context, db *database.DB, threshold float64) ([]Missing
 		}
 		// 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)
+		missing, err := ScanArtist(ctx, db, s.ID, threshold)
 		if err != nil {
 			log.Printf("scan artist %s failed: %v", s.ID, err)
 			continue