- video_player: ExoPlayer (Android) / AVPlayer (iOS/macOS) backend with
PixelBufferSink, method-channel adapter, Dart-side XVideoPlayer +
testing fake.
- insets: XInsets singleton + XAnimatedInsets widget lerp the system
viewPadding over 220ms so OS bar visibility toggles
(immersiveSticky <-> edgeToEdge) slide bottom-/top-anchored UI into
place instead of snapping by the nav-bar / status-bar height.
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