Add AccessibilityInfo.isSwitchControlEnabled on iOS

[camilopires]

Summary:

Switch Control lets people operate the device with one or more switches, scanning between elements. Apps that use time limits or auto-dismissing UI need to know when it's running, as they already can for screen readers. This was requested before in #31346, which was closed as stale. React Native apps can't currently detect this setting.

This adds AccessibilityInfo.isSwitchControlEnabled() and a switchControlChanged event, following the existing isDarkerSystemColorsEnabled pattern. It reads UIAccessibilityIsSwitchControlRunning() and observes UIAccessibilitySwitchControlStatusDidChangeNotification. On Android, the method resolves to false.

Discussion: react-native-community/discussions-and-proposals#1026

Changelog:

[IOS] [ADDED] - AccessibilityInfo.isSwitchControlEnabled() and switchControlChanged

Test Plan:

• yarn jest packages/react-native/Libraries/Components/AccessibilityInfo: all tests pass
• yarn flow-check: 0 errors
• yarn lint: passes
• yarn build-types --validate: API snapshot up to date
• yarn test-generated-typescript and yarn test-typescript-legacy: pass
• yarn format-check-cpp: passes
• RNTester builds for the iOS simulator using Xcode 27.1

On an iPhone 18 Pro simulator running iOS 27.0, RNTester's row reads "Switch Control is disabled.", which exercises the getter.

Not verified: turning Switch Control on. The iOS simulator's Settings app has no Switch Control option, so the change event wasn't exercised. It needs a physical device; I'll add the result here once I've run it.

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[github-actions]

Warning

JavaScript API change detected

This PR commits an update to ReactNativeApi.d.ts, indicating a change to React Native's public JavaScript API.

• Please include a clear changelog message.
• This change will be subject to additional review.

This change was flagged as: POTENTIALLY_BREAKING

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