feat: contact address with a sheen and a light on its underline

The address is the one thing to act on in the contact section, but it was a
plain underlined line next to a glowing message card. A slow sheen now runs
through the letters and a light travels along the underline; on hover the
whole line lights up.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

apps/web/src/components/home/ClosingCta.tsx

@@ -38,7 +38,7 @@ export const ClosingCta: React.FC<{ contact: Content["contact"] }> = ({
           {contact.lead}
         </p>
         <div className="mt-8">
-          <EmailLink className="inline-block border-b-2 border-white pb-2 font-sans text-2xl font-bold tracking-tight text-white no-underline transition-opacity hover:opacity-70 md:text-4xl" />
+          <EmailLink className="bit-mail font-sans text-3xl font-bold tracking-tight no-underline md:text-5xl" />
         </div>
       </Reveal>
       <Reveal delay={0.15} className="lg:col-span-6">