Shopify deletes an app's validation and delivery/payment customizations on
uninstall. Datewise now remembers which ones were on (settings.checkoutFunctions,
kept in sync with Shopify whenever Settings loads) and switches them back on
when a shop reinstalls.
LISTING.md and alt text updated to what the listing form accepted (5 features,
20-char search terms, 64-char alt text, no "plan" outside pricing).
Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>