[EnesKartal]

Fixes #5180

Summary of Changes

• Web Accessibility: On web, when role === "button", using aria-selected violates W3C ARIA specifications and triggers axe-core aria-allowed-attr violations.
  • When role === "button" on web, aria-pressed={selected} is emitted instead of aria-selected.
  • When selected is undefined (e.g. action chips without selection state), neither aria-pressed nor aria-selected is emitted.
  • When selected is provided on native or when role is not button (such as option or tab), aria-selected is preserved.
• Tests:
  • Added accessibility test suite verifying aria-pressed on web, omitting state for plain action chips, and maintaining aria-selected for native and non-button roles.
  • Updated snapshot expectations where action chips previously emitted selected: false.

Test Plan

• Run yarn test src/components/__tests__/Chip.test.tsx (all 32 tests pass).
• Run yarn typescript (typechecks cleanly).

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