Previously all cached ranking items were dumped into one page and the
page buttons only triggered refetches from novelfire — not navigation.
- handleRanking now reads ?page=N query param (default 1)
- Items sliced server-side at 20 per page (rankingPageSize constant)
- Template receives DisplayNums/CurrentPage/TotalPages for browse nav
- Display pagination bar renders GET /ranking?page=N HTMX links with
the active page highlighted in amber; hidden when only 1 page
- Fetch section collapsed into a <details> to reduce visual noise
- FetchNums replaces old PageNums field name in template data
9837c89075