feat: sticky Header with persistent contact CTA

app/page.tsx

@@ -1,3 +1,4 @@
+import { Header } from '@/components/layout/Header';
 import { Hero } from '@/components/sections/Hero';
 import { FraseAncla } from '@/components/sections/FraseAncla';
 import { ParaQuien } from '@/components/sections/ParaQuien';
@@ -18,6 +19,7 @@ export default function Home() {
   return (
     <>
       <script type="application/ld+json" dangerouslySetInnerHTML={{ __html: JSON.stringify(jsonLd) }} />
+      <Header />
       <main>
         <Hero variant="editorial" /> {/* dueña puede cambiar a "hormozi" */}
         <FraseAncla />