Accessibility problems (TalkBack/VoiceOver)

[Vasusn]

Description

When using flutter_intro, the guided intro steps shown through Intro + IntroStepBuilder are not read by accessibility services (Android TalkBack / iOS VoiceOver).
Screen readers do not focus on or announce the step content, and underlying widgets remain accessible even while the intro overlay is active.

Expected Behavior

• The intro overlay content (text or overlayBuilder) should be included in the accessibility tree
• Screen readers should automatically announce the step content when it appears
• Focus should move to the guided step instead of remaining on widgets behind the overlay
• Users should be able to navigate the intro using screen reader actions (Next / Continue / Skip)

Actual Behavior

• TalkBack/VoiceOver ignore the intro overlay entirely
• Focus remains on UI behind the highlight
• No spoken announcement when a new step is shown
• Users depending on accessibility services cannot follow the intro

Platforms Tested

Platform	Result
Android (TalkBack)	❌ Not accessible
iOS (VoiceOver)	❌ Not accessible