Currently, when adding a track to a release and trying to link it to an existing recording, the search box only allows searching by recording/track title (and artist).
However, many recordings already have ISRCs set, and ISRC is a unique identifier.

• Search Input could accept both text (title/artist) and ISRC.

• If an ISRC match exists, display those results at the top of the list (or provide an ISRC-specific search option).