PLAYLISTS header: smaller title, recursive search (hides title), create
modal at 1:1 with Tauri (name/description/folder/public), sort menu, and a
collapse chevron. Folders: accent-tinted icon, open/close chevron as the
primary affordance (no more purposeless "..."), count shown on hover only.
Playlists render a 2x2 micro-collage of track covers (opt-out) instead of
the glyph, sourced from the existing playlist images (no extra fetch).
cc