fix: Parse Saleor JSON description format to plain text

- Add parseDescription() helper to extract text from EditorJS JSON
- Update getLocalizedProduct to use parsed description
- Fix product descriptions showing raw JSON on frontend

src/lib/saleor/index.ts

@@ -32,4 +32,5 @@ export {
   isProductAvailable,
   formatPrice,
   getLocalizedProduct,
+  parseDescription,
 } from "./products";