mover doesn't handle focusable/tabbable elements within closed <details>

When you set up a mover and the page or the children of the mover container contains a closed details element which has interactive elements, like buttons within, as you navigate through the children, the focus is stuck on the non-visible button, and there is no way to move past this state.
Example:

<div data-tabster='{"mover":{}'>
  <button>item</button>
  <details>
    <summary>summary</summary>
    <button>item</button>
  </details>
  <button>item</button>
  <details>
    <summary>summary</summary>
    <button>item</button>
  </details>
  <button>item</button>
</div>

There is no way to move past the details elements' button with cursor keys.

Start by reproducing the HTML example with a mover and closed details elements, then trace the mover's cursor-key navigation handling. Add regression coverage for the non-visible buttons and verify that navigation moves past each closed details element without becoming stuck.