Fix: Accessibility support for ButtonGroup

Problem
Custom buttons passed to ButtonGroup do not propagate accessibilityLabel and accessibilityHint, so screen readers (TalkBack/VoiceOver) do not announce them.

Solution
• Extracted accessibility props from React elements
• Passed them to the underlying Pressable component

Testing
• Tested on Android emulator with TalkBack
• Verified correct announcement of label and hint

Example:

const buttons = [
  <Text accessibilityLabel="Podcast" accessibilityHint="Tap podcast">
    Podcast
  </Text>,
];

Checklist

• Code follows project style guidelines
• Self-reviewed changes
• No new warnings introduced
• Tested in example app
• Accessibility verified using TalkBack

Type of Change

• Bug fix (non-breaking change which fixes an issue)
• New feature
• Breaking change
• Documentation update required

Testing

• Tested on Android emulator with TalkBack
• Verified correct announcement of label and hint
• Unit tests added (not required for this change)