Function insert_tiles 

fn insert_tiles(
    grid: &FlowBox,
    albums: &[&LibraryAlbum],
    ctx: &Arc<AppContext>,
    on_click: &Rc<dyn Fn(&str, String)>,
    share: Option<Rc<dyn Fn(LibraryAlbum, AlbumAction)>>,
)

Add a tile per album; share (own albums only) enables the right-click “Share…”.