Fix Rescan and Rescan & recount on the item detail page

Re-scanning or splitting a bottle from its own page (not the inventory list) used to show "Still couldn't read this label" the instant you clicked, before the scan even ran - the real result showed up only after a manual reload. It now waits for the actual reading and updates the page automatically. That page's split dialog also gained the "these photos are separate items" option the inventory list already had, for when two different bottles got scanned in as one by mistake.