Category Cards arrows no longer depend on the header

On Category Cards, the arrows and the slide counter were rendered inside the section's header row. Turning the header off removed that row and took both of them with it, so a store running the cards with no heading had "Show arrows" switched on and no arrows anywhere, with nothing in the theme editor to explain why.

Show arrows and Show counter are now their own settings, exactly as they read. With the header off, they get a row of their own above the cards, keeping the same right-hand placement (centred if the section's alignment is set to centre). With the header on, nothing changes.

Two smaller consequences of the same fix:

• The thin progress track that appears under the cards existed only to give desktop some way to tell the rail scrolls when there was no nav at all. It now stands down when arrows are showing, instead of being drawn beside them.
• Below 860px the behaviour is unchanged: phones swipe the rail and show the progress track, and no empty band is left where the arrows would have been.

Open the app, go to Sections, and choose Update to latest on Category Cards. Your existing settings are kept.