[Feature Request] Local LRC files for synced lyrics

I recently started working on my own LRC files for my music library, and it would be great if _musicat_ could read those files locally instead of using an online service for situations where there is no Internet connection.

<img width="1731" height="836" alt="Image" src="https://github.com/user-attachments/assets/6d4dea36-8a9d-43a5-b71b-7ee22a2be950" />

