[upstream] Fixed another shape distance assert (box2d #926)

[ikpil]

Reduced number of global variables used in samples

[ikpil]

@CodiumAI-Agent /review

[CodiumAI-Agent]

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⚡ Recommended focus areas for review Coordinate Scaling Inconsistent use of static s_windowScale and s_framebufferScale versus context-based values may cause misaligned input and UI scaling on high-DPI displays. Monitor* primaryMonitor = _context.glfw.GetPrimaryMonitor(); if (null != primaryMonitor) { if (RuntimeInformation.IsOSPlatform(OSPlatform.OSX)) { _context.glfw.GetMonitorContentScale(primaryMonitor, out s_framebufferScale, out s_framebufferScale); } else { _context.glfw.GetMonitorContentScale(primaryMonitor, out s_windowScale, out s_windowScale); } Resource Lifecycle Verify that _context.draw.Destroy() and _context.draw.Create(_context) are always paired when samples are restarted or switched to avoid graphics resource leaks. { s_sample?.Dispose(); s_sample = null; _context.draw.Destroy(); DestroyUI(); } private void OnWindowResize(Vector2D<int> resize) { var width = resize.X; var height = resize.Y; Input Handling Confirm that GlfwHelpers.GetKey handles null or uninitialized context.window properly and that key state mapping remains correct when the context changes. public static unsafe InputAction GetKey(SampleContext context, Keys key) { if (null == context.glfw) return InputAction.Release; var state = context.glfw.GetKey(context.window, key); switch (state) {