[v3] macOS: Screen Bounds and WorkArea halved on Retina displays

[wayneforrest]

Description

[v3] On macOS, the Screen Bounds and WorkArea halved on Retina displays.

On macOS, application.Screen returns Bounds, WorkArea, and Size values that are half the real display
dimensions on any Retina display (backingScaleFactor > 1). PhysicalBounds and PhysicalWorkArea report the
actual point values of the display, not device pixels as their names suggest.

• Windows sized as a fraction of the work area end up roughly half the expected size, often clamping to
  configured minimums.
• Centering logic places windows based on half-sized screen rects, so windows appear offset or in the wrong
  quadrant.
• Any app that queries app.Screen.GetPrimary() / .GetAll() to lay out, snap, or position windows is
  affected.
• screen_windows.go and screen_linux.go are unaffected — this is macOS-only.

To Reproduce

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Expected behaviour

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Screenshots

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Attempted Fixes

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System Details

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Additional context

No response

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