Report a disabled Switch as disabled to iOS accessibility (#59333)

Summary:
On iOS, `<Switch disabled />` is drawn greyed out and ignores taps, but VoiceOver and XCUITest still report it as enabled: the `UIAccessibilityTraitNotEnabled` trait is missing.

Since #50796, the inner `UISwitch` is the Switch's accessibility element, so `RCTViewComponentView` writes the traits it derives from the role onto the `UISwitch`, replacing the ones UIKit sets, including `NotEnabled`. Since #57516, `accessibilityState.disabled` adds `NotEnabled` to those traits, but the iOS branch of `Switch.js` never sets it from `disabled`. The Android branch already does.

This moves the existing Android logic above the platform check so iOS gets the same `accessibilityState`. As on Android, `disabled` wins over `accessibilityState.disabled` when both are set. It is done in `Switch.js` rather than `RCTSwitchComponentView` because the Android branch already does it here, and a Switch-specific native writer for the traits would bring back the second trait writer that #57516 removed.

`disabled` now behaves exactly like `accessibilityState={{disabled: true}}` already does. That includes a Switch whose role maps to no trait, such as `accessibilityRole="none"`: it gets `NotEnabled` alone, without the switch trait.

## Changelog:

[IOS] [FIXED] - Report a disabled `Switch` as disabled to VoiceOver and XCUITest

Pull Request resolved: #59333

Test Plan:
Local regression validation:

```
js1 test "(CosmoCollapsibleSelector|CosmoConsentSection|CosmoReportBugForm|TWUISwitch|TWUIListCell|OCDevModeToggleRow|CosmoGeneralAppPreferencesSection|CosmoImportWizard|CosmoSettingsRow|TWAUGroupedMenuListCell|CosmoStudioSettingsBox|TWUIPaymentListCell|TWUIPeopleListCell)-test\.js$" --maxWorkers=4
# 13 suites passed; 66 tests passed; 30 snapshots passed; exit 0
arc lint -a
# No lint issues
```

The same targeted run before the snapshot update failed all 13 suites (16 snapshot failures). Updated only the expected disabled accessibility metadata in 16 snapshots. Removed one obsolete `TWUIPeopleListCell renders testSupportingText 2` entry: the helper invokes one snapshot assertion per exported test, so that second entry has no live producer; both retained snapshots are unchanged. Independent review found no blockers.

Added two cases to `Switch-itest.js`: `disabled` overriding `accessibilityState.disabled`, and no `accessibilityState` when `disabled` is not set. Fantom renders the Android branch, so these cover the logic both platforms now share; the iOS side is covered by the manual check below. Each new case fails when its part of the logic is changed.

```
yarn fantom packages/react-native/Libraries/Components/Switch/__tests__/Switch-itest.js
# 6 passed
yarn flow-check
# Found 0 errors
yarn eslint --max-warnings 0 packages/react-native/Libraries/Components/Switch/Switch.js packages/react-native/Libraries/Components/Switch/__tests__/Switch-itest.js
# no warnings
yarn prettier --check packages/react-native/Libraries/Components/Switch/Switch.js packages/react-native/Libraries/Components/Switch/__tests__/Switch-itest.js
# All matched files use Prettier code style!
```

Fantom was built locally on macOS with Xcode 27, whose clang needed `-Wno-deprecated-literal-operator` for the bundled `nlohmann/json.hpp`.

Manual check: a new 0.88.0 app (prebuilt core; `Switch.js` is the same on 0.88.0 and `main`) on an iPhone 17 Pro simulator, iOS 27. For "After", this branch's `Switch.js` was copied into the app's `node_modules/react-native/Libraries/Components/Switch/`. The accessibility tree was read with [AXe](https://github.com/cameroncooke/AXe) `describe-ui`, which reports each element's `enabled` attribute.

```tsx
<Switch testID="disabled-mount" value disabled />
<Switch testID="disabled-live" value disabled={liveDisabled} />
<Switch testID="disabled-state" value disabled accessibilityState={{disabled: true}} />
```

| Switch | Before | After |
| --- | --- | --- |
| `disabled-mount` | enabled | not enabled |
| `disabled-live`, after `disabled` is set to `true` | enabled | not enabled |
| `disabled-live`, after `disabled` is set back to `false` | enabled | enabled |
| `disabled-state` | not enabled | not enabled |

The role (`switch`) and value (`1`) are unchanged.

Not run: VoiceOver on a device.

Reviewed By: rubennorte

Differential Revision: D127141579

Pulled By: javache

fbshipit-source-id: c68bc8353788bd850cc2e00a7e69a8a0cb10bc92

Author: arun279

packages/react-native/Libraries/Components/Switch/Switch.js

@@ -177,6 +177,7 @@ const Switch: component(
   ...SwitchProps,
 }): React.Node {
   const {
+    accessibilityState,
     disabled,
     ios_backgroundColor,
     onChange,
@@ -227,16 +228,15 @@ const Switch: component(
     }
   }, [value, native]);
 
+  const _disabled = disabled != null ? disabled : accessibilityState?.disabled;
+
+  const _accessibilityState: ?AccessibilityState =
+    _disabled !== accessibilityState?.disabled
+      ? {...accessibilityState, disabled: _disabled}
+      : accessibilityState;
+
   if (Platform.OS === 'android') {
     const {onTintColor, tintColor, ...androidProps} = restProps;
-    const {accessibilityState} = androidProps;
-    const _disabled =
-      disabled != null ? disabled : accessibilityState?.disabled;
-
-    const _accessibilityState: ?AccessibilityState =
-      _disabled !== accessibilityState?.disabled
-        ? {...accessibilityState, disabled: _disabled}
-        : accessibilityState;
 
     const platformProps = {
       accessibilityState: _accessibilityState,
@@ -262,6 +262,7 @@ const Switch: component(
     );
   } else {
     const platformProps = {
+      accessibilityState: _accessibilityState,
       disabled,
       onTintColor: trackColorForTrue,
       style: StyleSheet.compose(

packages/react-native/Libraries/Components/Switch/__tests__/Switch-itest.js

@@ -46,6 +46,30 @@ describe('Switch', () => {
     );
   });
 
+  it('lets disabled override accessibilityState.disabled', () => {
+    const root = render(
+      <Switch
+        value={false}
+        disabled={false}
+        accessibilityState={{disabled: true, busy: true}}
+      />,
+    );
+
+    expect(
+      root.getRenderedOutput({props: ['accessibilityState']}).toJSX(),
+    ).toEqual(
+      <rn-androidSwitch accessibilityState="{disabled:false,selected:null,checked:None,busy:true,expanded:null}" />,
+    );
+  });
+
+  it('does not set accessibilityState when disabled is not set', () => {
+    const root = render(<Switch value={false} />);
+
+    expect(
+      root.getRenderedOutput({props: ['accessibilityState']}).toJSX(),
+    ).toEqual(<rn-androidSwitch />);
+  });
+
   it('renders with track and thumb color props applied', () => {
     // Exercises the color-resolution path; the mounted switch still renders as
     // the native switch host.