feat: allow configurable fetchPriority for poster image #373
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This adds an optional
posterFetchPriorityprop ("high"|"low"|"auto") tonext-video.By default, it’s
"auto", matching native behavior.But in common use cases - e.g. background videos shown immediately on page load - PageSpeed Insights recommends setting the poster image to
fetchPriority="high"to improve LCP.This gives users control to apply it only when appropriate.