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/bale.svg

@@ -0,0 +1,3 @@
+<svg xmlns="http://www.w3.org/2000/svg" width="16.159" height="12.176" viewBox="0 0 16.159 12.176">
+  <path id="Path_19534" data-name="Path 19534" d="M12.119.553a1.783,1.783,0,0,0-2.583,0L5.554,4.536a1.783,1.783,0,0,0,0,2.583l8.486,8.487a1.826,1.826,0,1,0,2.583-2.583l-7.2-7.2,2.691-2.691A1.783,1.783,0,0,0,12.119.553Z" transform="translate(0 17.176) rotate(-90)" fill="#333132"/>
+</svg>