Swap token for the page-row truncation algorithm. The default resolves to
createPaginatorPageWindow; override it to replace the whole windowing
computation enterprise-wide (via providers) or per-component (via
viewProviders) without forking the segment. Per-instance tweaks to the
sibling / boundary counts use the [siblingCount] / [boundaryCount] inputs
on cngx-pgn-pages instead. Mirrors CNGX_PAGINATOR_ANNOUNCER_FACTORY.