There is no way to line lyrics up with the track by hand #717

The problem

When synced lyrics are off from the recording, there is nothing a user can do about it. The karaoke runs early or late for the whole song, a line click jumps to the wrong place, and the only options are to live with it or remove the lyrics.

It happens more than it should. LRCLIB often holds a copy timed to another cut of the song: a video with an intro, a single edit, a remaster with the silence trimmed. Automatic alignment catches the clear cases, but not every one.

What would help

• A way to say where the lyrics start: put the first line, or a chosen line, at the current playhead.
• Small nudges earlier and later, with the current offset shown.
• An automatic detect on request, which says so plainly when it cannot tell.
• A way back to the lyrics' own timing.

Constraints

• The adjustment must survive closing and reopening the track, and a re-split.
• The original timing must always be recoverable.
• It has to work for lyrics the server keeps and for lyrics the Lyrics tab found on its own.
• Keyboard accessible, in all ten languages.

Requested while testing the 0.18.2.dev0 build. Being worked on in the feat/song-identification branch.