fix: report the unfolded screen size in device.info on foldables

[gmegidish]

Summary

device.info returned the cover display's size on foldables even when unfolded, because SpringBoard reports the cover display's frame regardless of the hinge.

• device.info now uses the inner display's size when the foreground app is on it
• Added OrientationGeometry.secondaryDisplaySize(), reusing the window-based size logic from fix: taps on folded foldables and unfolded springboard #89
• Single-display devices keep the old path and skip the foreground app lookup

Result on iPhone Duo simulator (iOS 27.1)

Posture	Before	After
folded	466x678	466x678
half-open	466x678	669x951
open	466x678	669x951

Test plan

• Build for the iPhone Duo simulator
• device.info in folded, half-open and open postures
• RPC test suite (tests/rpc.test.ts)
• device.info on a non-foldable simulator
• device.info on a real device

[coderabbitai]

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📥 Commits

Reviewing files that changed from the base of the PR and between 59620a3 and 0aab855.

📒 Files selected for processing (2)

• DeviceKitTests/JSONRPC/Handlers/DeviceInfo.swift
• DeviceKitTests/XCTest/OrientationGeometry.swift

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