Reported issues / fixes

• [x] Fix checkout currency conversion - Deployed, some errors still present
  • [x] Conversion issues with single-unit currencies - @Maya
• [x] Resolve ambiguous permalinks in overlay
• [x] Don't render recaptcha on preview page
• [x] Support legacy ?variant and ?yearly parameters
• [x] Ignore overlay links in rich text editor
• [x] Only show discount code field when at least one product needs them
• [x] Fix discount code field showing up on all check out pages
  • [x] Only show if at least one product has the option turned on
• [x] missing_variants errors (Slack) - Migrate legacy non-physical products with more than one variant category (1909 affected products) to SKUs
  • Backup of IDs
• [x] Don’t show discount notice if discount is 0
• [x] Bring back discount strikethroughs and don’t show discount notice if discount is 0
• [x] When clicking the Add to Cart button, replace existing item’s quantity with the selected one
• [x] Fix product page offer codes on overlay/embed
• [x] Handle line breaks in option descriptions - @Connor Mann
• [x] ?wanted=true does not open up checkout page when visited from browser - @Connor Mann
• [x] The "Continue shopping" button does nothing when redirected from a custom domain or an external redirect - @Connor Mann
  • [x] When a product is added to the cart from an overlay, “Continue shopping” should route back to the exact page where the overlay is hosted.
• [x] Support gum.co links for overlay - @Maya
• [x] Hide discount pill on checkout page when discount is 0 - @Maya
• [x] Fix native PayPal - @Maya