Implement multilingual support for shop interface and add total calculation to cart drawer:
- Add FR/EN translations for all shop-related texts (cart, checkout, stock status)
- Update templates and JavaScript to use translation system
- Add cart total calculation with formatted currency display
- Refactor cart drawer styles to SASS with improved button styling (black borders on +/-)
- Fix English product content (replace JSON with proper HTML)
- Extract cart drawer to separate snippet for better organization
Co-Authored-By: Claude Sonnet 4.5 <noreply@anthropic.com>
Replace Shopify Buy Button iframe with custom implementation using Storefront API 2026-01. Create interactive cart drawer with full product management capabilities (add, remove, update quantities) and seamless checkout flow.
Co-Authored-By: Claude Sonnet 4.5 <noreply@anthropic.com>
