feat(landing): warm up the contact CTAs (#412)

Give the contact calls-to-action a friendlier, more human voice. The nav
"Contact" link and the FAQ "Contact Us" button become "Talk to a human",
and the Enterprise pricing "Contact Sales" becomes "Let's talk". All links
still point to /contact; only the labels change.

Claude-Session: https://claude.ai/code/session_01MbQGV1k1mneFidgGyDnmDQ

apps/landing/src/pages/faq.astro

@@ -115,7 +115,7 @@ const breadcrumbJsonLd = {
         <h2 class="font-display text-xl font-semibold">Still have questions?</h2>
         <p class="mt-2 text-sm text-muted">Reach out via email or join our community.</p>
         <div class="mt-6 flex flex-col items-center gap-3 sm:flex-row sm:justify-center">
-          <a href="/contact" class="btn-primary rounded-lg px-6 py-2.5 text-sm font-semibold">Contact Us</a>
+          <a href="/contact" class="btn-primary rounded-lg px-6 py-2.5 text-sm font-semibold">Talk to a human</a>
           <a href="https://discord.gg/hr3s7HPUsr" target="_blank" rel="noopener noreferrer" class="rounded-lg border border-border px-6 py-2.5 text-sm font-semibold transition-colors hover:bg-background-alt">Join Discord</a>
         </div>
       </div>