fix: detect followed playlists correctly in header

Load owner+subscriber playlists, track all playlist IDs for follow-state resolution, and keep audio ring buffer at 32k as requested.

src/list/library.cpp

@@ -99,6 +99,7 @@ void Library::onUserPlaylistsLoaded(const QJsonObject &result)
     while (m_playlistsNode->childCount() > 0)
         delete m_playlistsNode->takeChild(0);
 
+    QSet<qint64> allPlaylistIds;
     QVector<QPair<qint64, QString>> editablePlaylists;
     const qint64 myUserId = AppSettings::instance().userId();
     const QJsonArray items = result["items"].toArray();
@@ -109,6 +110,9 @@ void Library::onUserPlaylistsLoaded(const QJsonObject &result)
         const qint64      ownId = static_cast<qint64>(pl["owner"].toObject()["id"].toDouble());
         const bool        isOwner = (myUserId > 0 && ownId == myUserId);
 
+        if (id > 0)
+            allPlaylistIds.insert(id);
+
         auto *item = new QTreeWidgetItem(m_playlistsNode, QStringList{name});
         item->setData(0, TypeRole,    NodePlaylist);
         item->setData(0, IdRole,      id);
@@ -120,6 +124,7 @@ void Library::onUserPlaylistsLoaded(const QJsonObject &result)
             editablePlaylists.append({id, name});
     }
 
+    emit userPlaylistIdsChanged(allPlaylistIds);
     emit userPlaylistsChanged(editablePlaylists);
 }