VideoPlayer

[colemancda]

AVKit-style video playback.

What's new

• VideoPlayer(player: AVPlayer(url:)) — mirrors the AVKit spelling (URL-backed playback only); emits a VideoPlayer node carrying the media URL
• The interpreter's video composable is platform-specific (expect/actual): Android hosts a Media3 ExoPlayer in a PlayerView with the standard playback controls, prepared paused on the first frame and released on dispose; the desktop rig shows a labeled placeholder (no media stack)
• Media3 (media3-exoplayer + media3-ui) added to the interpreter's androidMain — the legacy MediaPlayer/VideoView stack proved unreliable for remote streams (tried first: failed with MEDIA_ERROR_UNKNOWN on a reachable URL)
• Demo app now requests INTERNET

Verification

• swift test — URL emission test, 58 passing
• Emulator (new Video screen): streams the Big Buck Bunny sample over HTTPS — controls render, play starts buffered playback, and a mid-playback screenshot shows real frames at 00:04 of 09:56

Notes

Depends on #35 (branched from it); its commits drop out of this diff once that merges. Playback state is player-owned (no play/pause/seek bridge surface yet); desktop playback deferred.