Double desktop header logo, add English caption under each carousel title

- Header logo (desktop variant) doubled: 40/48px -> 80/96px.
- Each dynamic store-specials carousel now shows an English caption
  under its title at 50% opacity, derived from the group's real `key`
  (e.g. "top-selling" -> "TOP SELLING") rather than inventing a
  translation of the Persian title, which the API doesn't provide.
  New SectionTitle `enSubtitle` prop (separate from the existing
  inline `enTitle`) carries this.

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

src/components/home/StoreSpecialCarousels.tsx

@@ -6,6 +6,18 @@ import { TwoBanners } from "@/components/home/TwoBanners";
 import { ThreeBanners } from "@/components/home/ThreeBanners";
 import { productHref, type ProductGroup, type StaticImageWithUrl } from "@/lib/meshkee";
 
+// The API only gives one `title` string per group (sometimes already
+// English, e.g. "Special Sale", sometimes Persian) — there's no separate
+// localized English field to pull a real translation from, and inventing
+// one would be fabricated data. `key` is real data and usually a readable
+// English slug (e.g. "top-selling"), so it's what gets formatted into the
+// English caption under the title. Skip it if the key has no letters at
+// all (e.g. it fell back to a bare numeric id).
+function englishLabelFromKey(key: string): string | undefined {
+  const label = key.replace(/[-_]+/g, " ").trim();
+  return /[a-zA-Z]/.test(label) ? label.toUpperCase() : undefined;
+}
+
 // Renders every admin-managed carousel from GET /store-specials — whatever
 // groups exist there, in their configured order. Nothing here is keyed off
 // a specific group id/key/title, so a new carousel created in the Meshkee
@@ -46,6 +58,7 @@ export function StoreSpecialCarousels({
             <div className="mx-auto max-w-7xl px-4">
               <SectionTitle
                 title={group.title}
+                enSubtitle={englishLabelFromKey(group.key)}
                 action="مشاهده همه"
                 actionHref={`/products?specialId=${group.id}`}
               />