Add an expandable search (title / artist), a sort QbzSelect
(Default / Title A-Z / Title Z-A / Artist A-Z) and a Shuffle header
action (play a random visible album) to the Albums tab. albums-visible
derives from the full albums set via derive_albums (shared model on the
no-filter/default fast path, filtered+sorted clone otherwise — the
label.rs::derive_releases pattern), and the count reflects the filter.
cc