feat(music): mark the current playlist row on its number

Emacs draws the filled cursor only in the selected window, and the playlist dock is glanced at from other windows constantly. The pinned cursor was invisible exactly when it was wanted. The current row's number now renders in inverse video, updated as point moves and re-applied after each renumber. The mark shows whether or not the window has focus, and the row band from hl-line was already sticky.

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