Set AccessibilityNodeInfo stateDescription for checked state on Android

[BilalWalker]

Summary:

On Android, TalkBack announces no state for an unchecked React Native checkbox or radio: role="checkbox" / role="radio" with aria-checked={false} (or accessibilityState={{checked: false}}) is read as just "Email me offers, tickbox", so a TalkBack user cannot tell an unchecked option from an element with no state at all (#58739). A role="switch" with checked: true is read as "checked. on." (#58588).

Both have the same root cause. Since API 30 TalkBack speaks the state of a checkable node from AccessibilityNodeInfo.stateDescription, and only suppresses its own generic "checked" when one is set. Native CompoundButton (CheckBox, RadioButton, Switch) always sets it; ReactAccessibilityDelegate.setState only set isCheckable / isChecked and never called setStateDescription. No JavaScript prop reaches stateDescription, so apps cannot work around this.

This change sets stateDescription in the same place isCheckable / isChecked are set:

• role switch: on / off, from the existing state_on_description / state_off_description resources, which are already translated in all 65 locales under uimanager/res.
• any other checkable (checkbox, radio, togglebutton, or no role) and unchecked: not checked, from a new state_unchecked_description resource.
• any other checkable and checked: left unset, so TalkBack keeps announcing it in the device language ("Ticked", "Aktiviert", ...), exactly as today.

Only the case TalkBack is currently silent on gets a new string. Translations of the uimanager strings come from Meta's internal translation pipeline ("Intl Scheduler" commits), not from pull requests, and the existing link_description, rn_tab_description and timer_description are in the same English-only state until it runs again. Keeping the checked state with TalkBack avoids a regression for non-English users in the meantime (see the discussion on #58739).

The mixed string value keeps its existing handling in BaseViewManager.updateViewContentDescription.

Fixes #58739
Fixes #58588

Changelog:

[ANDROID] [FIXED] - Set stateDescription so TalkBack announces unchecked checkboxes and radios, and no longer reads "checked. on." for switches

Test Plan:

yarn format-check-kotlin                                   # clean
./gradlew :packages:react-native:ReactAndroid:testDebugUnitTest \
  --tests "com.facebook.react.uimanager.ReactAccessibilityDelegateTest"

Result: BUILD SUCCESSFUL, ReactAccessibilityDelegateTest: 22 tests, 0 failures (14 existing + 8 new).

On Windows the Gradle run also needed -Preact.internal.windowsBashPath=..., a pre-built codegen (yarn --cwd packages/react-native-codegen build with -x :packages:react-native:ReactAndroid:buildCodegenCLI) and a checkout path without spaces; none of that is part of this change.

New Robolectric tests in ReactAccessibilityDelegateTest cover: unchecked checkbox, checked checkbox (stateDescription stays unset), unchecked radio, unchecked state with no role, switch on and off via accessibilityRole, switch off via the role prop, and that a state map without checked leaves stateDescription unset.

I was not able to verify on a device with TalkBack; the expected announcements follow the behavior of native CompoundButton, which TalkBack already handles this way.

[BilalWalker]

Pushed cff022c in response to the discussion on #58739: for checkbox/radio, stateDescription is now only set for the unchecked state (new state_unchecked_description), so the checked announcement stays TalkBack's localized one. The switch role keeps the already-translated state_on_description / state_off_description. Dropped the unused state_checked_description. Description updated; ReactAccessibilityDelegateTest 22/22 still passing.

[salrahman]

Thanks @BilalWalker, the narrowed version looks right to me. The checked state keeps TalkBack's own localised wording, the unchecked state finally gets announced, and switches reuse the already-translated on and off strings. For TalkBack users, an English "not checked" is a clear improvement on silence while the translations catch up.