SegmentedButtons: each segment sets aria-checked on role button #5181

Current behaviour

Each segment renders role="button" with aria-checked (SegmentedButtonItem.tsx). On the web aria-checked is not allowed on role button, so the checked state is not announced, and axe-core reports aria-allowed-attr (critical): "ARIA attribute is not allowed: aria-checked".

Expected behaviour

Each segment keeps aria-checked and takes a role that supports it: radio for single select (with the row as a radiogroup) and checkbox with multiSelect. axe reports no aria-allowed-attr violation.

How to reproduce?

1. Run the example app on the web from main (yarn install, then npx expo start --web in example/).
2. Open the Segmented Buttons example (/segmented-button).
3. Run axe-core on the page.

Preview

What have you tried so far?

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