Add about/contact pages, real social icons, and gallery scroll fix

- Add /about (business-info driven, falls back to existing copy) and
  /contact (business-info contact details + a working form posting to
  the contact-submissions API)
- Point header/footer "About"/"Contact" links at the new pages instead
  of homepage anchors
- Replace the hand-drawn social icons with the real brand SVGs from
  public/icons (Instagram, Telegram, WhatsApp, Bale, Eitaa), inlined
  with currentColor so hover states work; shared via a single
  socialLinks list used by both header and footer
- Remove the horizontal scrollbar under the product gallery thumbnails
  by wrapping them instead of scrolling

public/icons/instagram.svg

@@ -0,0 +1,5 @@
+<svg id="Group_3409" data-name="Group 3409" xmlns="http://www.w3.org/2000/svg" width="15.746" height="15.746" viewBox="0 0 15.746 15.746">
+  <path id="Path_2388" data-name="Path 2388" d="M11.4,0H4.345A4.35,4.35,0,0,0,0,4.345V11.4a4.35,4.35,0,0,0,4.345,4.345H11.4A4.35,4.35,0,0,0,15.746,11.4V4.345A4.35,4.35,0,0,0,11.4,0Zm2.949,11.4A2.952,2.952,0,0,1,11.4,14.349H4.345A2.952,2.952,0,0,1,1.4,11.4V4.345A2.952,2.952,0,0,1,4.345,1.4H11.4a2.952,2.952,0,0,1,2.948,2.948V11.4Z" transform="translate(0)" fill="#333132"/>
+  <path id="Path_2389" data-name="Path 2389" d="M45.025,40.97a4.057,4.057,0,1,0,4.057,4.057A4.062,4.062,0,0,0,45.025,40.97Zm0,6.718a2.66,2.66,0,1,1,2.66-2.66A2.663,2.663,0,0,1,45.025,47.688Z" transform="translate(-37.152 -37.154)" fill="#333132"/>
+  <path id="Path_2390" data-name="Path 2390" d="M119.946,28.251a1.024,1.024,0,1,0,.725.3A1.029,1.029,0,0,0,119.946,28.251Z" transform="translate(-107.845 -25.62)" fill="#333132"/>
+</svg>