fix: include stepStateText in StepListItem accessible name (#9888)
Add the VisuallyHidden stepStateText element to the aria-labelledby
of each StepListItem link so screen readers announce the step state
(Current/Completed/Not completed) as part of the accessible name.
This ensures conformance with WCAG SC 2.5.3 Label in Name (Level A)
by including the visually hidden but rendered step state text in the
computed accessible name for each step.
Closes #9881