[Video] Visibility detection view (#4741)

Co-authored-by: Samuel Newman <10959775+mozzius@users.noreply.github.com>

src/view/com/util/post-embeds/VideoEmbedInner/VideoEmbedInnerNative.web.tsx

@@ -0,0 +1,3 @@
+export function VideoEmbedInnerNative() {
+  throw new Error('VideoEmbedInnerNative may not be used on native.')
+}