After the embedded-title change (recognize vs "recognize - Single"), Navidrome's title-derived stem can drop the "- Single"/"- EP" suffix the on-disk filename still carries, so _findFileByStem matched neither exact nor suffix and every fallback failed -> "File not found on disk" on edit/delete. Now also match on the structured prefix in both directions. Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>