`-qaScreenMarker` paints the screen flat magenta, which lets a macOS capture
locate the device-screen rectangle exactly and map simulator-screenshot pixels
to click coordinates. `simctl` cannot drive taps and the project has no UI-test
target, so this is the only way to test real touch behaviour on the sheet.
Guarded by #if DEBUG, exactly like the existing -qaCopyPostcode hook.
FuelBoard Contributor
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