The inner role="combobox" <input> is covered by
the .ant-select-selection-item span (intercepts a normal click),
and the option rows are role-less
<div class="ant-select-item-option" title="…"> — exactly
what rc-select renders. The current value "Participant" is
also an option, so resolution must scope to the
aria-controls listbox by text/title, not page-wide.