feat(video): add YouTube lightbox to benefits section

Replaces static video link with a self-contained VideoCard component
that opens a native <dialog> lightbox with autoplay on open and
iframe src teardown on close. Includes pulsing ring animation on the
play button and a rounded-triangle SVG icon.

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

www/src/content/pages/en/index.md

@@ -50,7 +50,8 @@ sections:
       - Individualized Results
       - Sensory-Friendly Rooms
       - Convenient and Affordable
-    videoHref: /tour
+    videoUrl: "https://www.youtube-nocookie.com/embed/EczPH1jx9mc?si=beestOCaO4tL7Re6"
+    videoTitle: AIA Learner Journey
     videoImage: learner-journey.webp
     videoImageAlt: Learner journey for children with autism video
 

www/src/content/pages/es/index.md

@@ -50,7 +50,8 @@ sections:
       - Resultados individualizados
       - Salas sensoriales
       - Conveniente y asequible
-    videoHref: /tour
+    videoUrl: "https://www.youtube-nocookie.com/embed/EczPH1jx9mc?si=beestOCaO4tL7Re6"
+    videoTitle: AIA Learner Journey
     videoImage: learner-journey.webp
     videoImageAlt: Video del recorrido del estudiante