Pagination ellipsis uses role="presentation" on <li>, causing list structure a11y violation

Problem/Motivation

That axe reports: “<ul> and <ol> must only directly contain <li>, <script>, or <template>” because the ellipsis <li> has role="presentation".

Steps to reproduce

1. Install Drupal with Radix (e.g. 6.x) as the active theme (or a Radix subtheme).
2. Create enough content so a paged list appears (e.g. a view with a small “Items per page” so pagination shows).
3. Open a page that shows the pager (e.g. a listing with “Next »” / page numbers).
4. Run an accessibility checker (e.g. axe DevTools) on that page.
5. Observe the failure: rule “List element has direct children that are not allowed” — the pagination <ul> has <li> elements with role="presentation" (the ellipsis items), which violates the requirement that list elements only directly contain <li>, <script>, or <template>.

Proposed resolution

Remove role="presentation" from those <li>s
And use aria-hidden="true" on the inner span
And add a visually-hidden “More pages” label for screen readers(see MR)

Remaining tasks

User interface changes

API changes

Data model changes