FINAL LINKEDIN THUMBNAIL CORRECTIONS

- Confirmed the public URL as https://dalvictech.com.ng/adesoyemathew/.
- Corrected all four case-study pages that still referenced the mistaken DigiSafe subdomain.
- Corrected the upload instructions that still pointed to public_html/digisafe/.
- Added the Open Graph namespace to every HTML document.
- Added og:image:url and rel=image_src crawler fallbacks to shareable pages.
- Added twitter:url metadata.
- Added linkedin-preview-v2.jpg and referenced it in social metadata to bypass LinkedIn's old cached image URL.
- Kept linkedin-preview.jpg for backward compatibility.
- Added an adesoyemathew/.htaccess file with correct image MIME, caching and public access headers.
- Preserved the existing design, content, CSS, JavaScript, animations and responsive behaviour.