Mobile: Accessibility focus doesn't move when opening dialogs

[personalizedrefrigerator]

Environment

Joplin version: 12.12.1
Platform: iOS, Android
OS specifics: iOS 16.6, Android 10

Steps to reproduce

1. Enable VoiceOver/TalkBack
2. Open Joplin
3. Open a dialog (e.g. by clicking on the "⠇" button)

Describe what you expected to happen

The accessibility focus should move to the dialog.

[personalizedrefrigerator]

Status update:

• Some dialogs capture focus (e.g. plugin information dialogs).
• Many 3rd-party dialogs (e.g. react-native-dialogbox) and menus don't receive accessibility focus when opened.