single band COG display should be able to work with built-in color palette

special handling is needed - documented https://github.com/openlayers/openlayers/issues/15894

-> if no style defined on catalog, try to check this way if tiff has color palette, then load it specially

Start by reading the linked OpenLayers issue #15894, then locate the catalog style handling and single-band COG display entry point. The work is done when a catalog without a defined style detects a TIFF color palette and displays it using that palette, while existing styled catalogs continue to work.

Written by the indexing model from the issue text.