feat(ios): voiceover read contents of input element

[eszlamczyk]

What/Why?

EnrichedMarkdownTextInput was effectively invisible to VoiceOver on iOS - focusing it announced nothing ("description
unavailable"), it exposed no value, and consumer accessibility props weren't forwarded.

Root cause: the input's inner UITextView uses a custom TextKit 1 stack, so it doesn't vend native text accessibility, and the Fabric host collapsed the subtree into an empty element.

This makes the host present itself as a single VoiceOver element that reads the field's content as one paragraph:

• isAccessibilityElement + accessibilityValue → the full plain text (placeholder when empty).
• accessibilityActivate → focuses the field and opens the keyboard for editing.
• Placeholder label excluded from the accessibility label so it doesn't shadow the real text.

Consumer accessibilityLabel/accessibilityHint now land on the host and are announced. Android already worked (native EditText), so this is iOS-only. Known limitations (no native "text field" role, no in-field cursor nav/echo, value refreshes on re-focus) are documented in docs/ACCESSIBILITY.md.

Testing

Everything was tested via playground (with xcode Accessability Manager
Android checked on real device.

Screenshots

PR Checklist

• Code compiles and runs on iOS
• Code compiles and runs on Android
• Updated documentation/README if applicable
• Ran example app to verify changes
• E2E tests are passing
• Required E2E tests have been added (if applicable)

Adresses #521

[Copilot]

Pull request overview

This PR improves iOS VoiceOver support for EnrichedMarkdownTextInput by making the Fabric host view present itself as a single accessibility element that exposes the editor’s current plain-text contents (or placeholder when empty) and can be activated to focus/open the keyboard. It also documents the simplified accessibility model and limitations in docs/ACCESSIBILITY.md.

Changes:

• iOS: mark the host component as an accessibility element, provide accessibilityValue, and implement accessibilityActivate to focus the underlying text view.
• iOS: attempt to hide the placeholder label from accessibility to avoid conflicting announcements.
• Docs: add a dedicated section describing the input accessibility behavior on iOS/Android and list known limitations.

Reviewed changes

Copilot reviewed 2 out of 2 changed files in this pull request and generated 3 comments.

File	Description
packages/react-native-enriched-markdown/ios/input/EnrichedMarkdownTextInput.mm	Adds iOS VoiceOver support by vending a single accessibility element/value and activation behavior for the editor.
docs/ACCESSIBILITY.md	Documents the text input accessibility model and its limitations across iOS and Android.

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