Function project_albums 

pub(crate) fn project_albums<'a>(
    albums: &'a [LibraryAlbum],
    current_user: &str,
    query: &str,
    sort: AlbumsSort,
) -> (Vec<&'a LibraryAlbum>, Vec<&'a LibraryAlbum>, Vec<&'a LibraryAlbum>)

Pure projection over the cached album list. Returns the (recent, owned, shared) buckets that drive the three Albums-view rows after applying the active search filter and sort mode. Extracted from render_albums so the ordering rules can be unit-tested without GTK.