Polish product/blog detail pages: gallery, tabs, Persian names, image fixes

- Product detail: interactive image gallery (thumbnails, prev/next,
  hover-zoom), tabbed spec/review/comments section matching the site's
  standard pattern, variations/options display, and an availability
  label instead of duplicating the contact-store message.
- Fix product.images normalization — the API returns {url} media objects,
  not plain strings, so galleries were silently rendering empty.
- Prefer the Persian name (nameFa/productNameFa) everywhere a product
  name is shown.
- Product cards: padded, rounded images instead of edge-to-edge with a
  dashed divider.
- Blog: wire the homepage carousel to real posts (was static sample
  data), drop the detail page's separate cover image, and make images
  embedded in article/description HTML fill their container with
  rounded corners.

Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>

src/app/globals.css

@@ -83,3 +83,9 @@ body {
 .carousel-track::-webkit-scrollbar {
   display: none;
 }
+
+.prose img {
+  width: 100%;
+  height: auto;
+  border-radius: 1rem;
+}