Fix nav to viewport with position: fixed

Sticky wasn't working due to overflow: hidden on hero. Switched to
fixed positioning with body padding-top to compensate.

Generated with [Claude Code](https://claude.ai/code)
via [Happy](https://happy.engineering)

Co-Authored-By: Claude <noreply@anthropic.com>
Co-Authored-By: Happy <yesreply@happy.engineering>

Author: 3 people

docs/projects/nthpartyfinder/index.html

@@ -56,6 +56,7 @@
   color: var(--text);
   background: var(--bg-deep);
   -webkit-font-smoothing: antialiased;
+  padding-top: 68px;
 }
 a { color: var(--neon-pink); text-decoration: none; transition: color .2s; }
 a:hover { color: var(--neon-blue); }
@@ -83,7 +84,7 @@
 
 /* ── NAV ── */
 .nav {
-  position: sticky; top: 0; z-index: 100;
+  position: fixed; top: 0; left: 0; right: 0; z-index: 100;
   background: rgba(6, 6, 15, 0.85);
   backdrop-filter: blur(20px);
   border-bottom: 1px solid var(--border);