fix(frontend): add title attribute to YouTube iframe for accessibility

Screen readers need a title attribute on iframes to describe their
content. Added "YouTube video player" title to the embedded video.

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

autogpt_platform/frontend/src/app/(platform)/marketplace/components/WaitlistDetailModal/WaitlistDetailModal.tsx

@@ -63,6 +63,7 @@ function VideoPlayer({
     return (
       <iframe
         src={`https://www.youtube.com/embed/${youtubeId}${autoPlay ? "?autoplay=1" : ""}`}
+        title="YouTube video player"
         className={className}
         allow="accelerometer; autoplay; clipboard-write; encrypted-media; gyroscope; picture-in-picture"
         sandbox="allow-same-origin allow-scripts allow-presentation"