fix(music): show the cursor on the row number and open the dock taller

With point pinned at the row start, redisplay drew the cursor after the number's before-string, on the album-art thumbnail, where a block cursor is invisible. A cursor property on the number string makes redisplay draw it on the number.

The dock also kept reopening too short: its height memory remembered whatever size the window had at toggle-off, including squeezes from window churn. The squeezed fraction then overrode the default on every later open. The default rises to a third of the frame, and the toggle discards captured heights below it (a deliberate enlargement still sticks for the session).

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