fix(library): restore offline visibility and unify filters and sorting

Recover missing offline library entries, recognize cached-only libraries, and refresh availability after cache changes. Unify per-tab filters, compact the toolbar, and add reversible sort criteria with complete available purchase metadata.

cx

crates/qbz-playlist-import/src/match_qobuz.rs

@@ -433,6 +433,7 @@ mod tests {
             streamable: None,
             streamable_at: None,
             release_date_stream: None,
+            release_date_original: None,
         }
     }