fix(hub): give the Music flat list its own look instead of Videos' reskin

Two complaints against real use: the artist -> album -> track hierarchy
was invisible (every depth sat flush left, distinguishable only by which
chevron happened to be open — Videos' own flat list never needed more
than one level, so there was nothing to reuse for this), and a filled-in
album unfolded into a wall of identical little icon-box squares, one per
track, carrying no information a track row can actually use (unlike
Videos' per-episode thumbnail).

Track rows now reuse Mode A's own numbered tracklist style
(.music-track-row: number, title, duration, no icon box) instead of
Videos' boxy thumb-slot row. A folder's expanded contents get wrapped in a
new .music-flat-children indent + rule line, so nesting reads as visible
steps into the tree rather than same-level siblings. Folder rows
(artist/album headers) still reuse Videos' flat-row style, which fits them
fine — this is not a wholesale rewrite, only what didn't actually work.

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