Improvements and fixes

Finding a domain now shows a progress panel while it searches, and the See suggested domain button shows its progress too.
The Suggest more options link in the domain finder no longer asks about unsaved changes.
Saving your Walmart or Etsy IDs in Main Account settings now updates your existing sites too, except any site where you set its own.
The site admin login page tells invited helpers to sign in there, and to ask the owner for a fresh invite if they forget their password.
The site admin login page now links site owners back to their Main Account.
Imported sites keep their buttons: a Shop Now button on your old site comes across as a button on your new one, in your template's style.

Hiding a merchant image on a product now takes it off your product page straight away.
Store Health no longer offers to publish an article that has no text yet; edit or delete it instead.
Saving your Amazon settings no longer fails if you once filled in the retired China country.
Import Articles now sets the featured image when the file names a picture already on your store, such as an article exported from it.
The Walmart settings page now says not connected when the saved ID cannot track sales, such as a store name.
New sites built from a ready-made store no longer show broken product images when the source store pictures changed just before the build.
Checkout now says so plainly and offers the other payment methods when PayPal or a wallet cannot load on a slow connection.
Store admin pages open faster on sites with many products, because the Your Reviews menu count is no longer worked out on every page.
Product feed imports now retry product pictures that failed to copy, on the next feed run.