Avalonia viewbox scale #414
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When VideoView is placed inside a Viewbox, the native window size was not matching the visual size due to Viewbox applying a RenderTransform rather than changing the actual Bounds. This fix uses window subclassing to intercept WM_WINDOWPOSCHANGING messages and enforce the correct scaled size calculated via PointToScreen, which accounts for all visual transforms including Viewbox scaling.
Use TransformToVisual instead of PointToScreen to calculate the scaled size, which avoids feedback loops caused by the native window's current size affecting the calculation. Add ArrangeOverride to update the scaled size before the native window is resized, which fixes scaling when parent layout changes (e.g., GridSplitter resizing rows inside a Viewbox).
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