Dual-pane patterns, dimensions and hinge callbacks The sibling skills explain the platform: reserved regions and arrangements in , the hinge and scenes in , design principles in . This one is the applied layer: the numbers you'll want when mocking up or sizing assets, the exact shapes of the hinge callbacks, and the proven patterns for what to put in each pane — drawn from Apple's material plus a decade of dual-screen guidance from Microsoft (Surface Duo), Google (Android foldables) and Samsung (Flex Mode), which all converge on the same answers. The numbers From Apple's published specs. Use…