The preflight system check already warns in-app when yt-dlp is missing (Voice Gallery/Dub YouTube downloads fail without it), but the install docs never mentioned it — a user has to hit the in-app warning first instead of seeing it up front alongside the other optional prereqs. Co-authored-by: mergetest <test@local> Co-authored-by: Claude Fable 5 <noreply@anthropic.com>