Build pagination

• Given total items and pageSize, shows previous and next buttons and numbered page buttons
• Long ranges collapse with ellipses, for example 1 ... 4 5 6 ... 20, always showing the first page, the last page and the current page with its neighbours
• Previous is disabled on page 1 and next on the last page; the current page has aria-current="page"
• A page-size selector (10, 25, 50) resets to page 1 and recomputes the page count
• The current page and page size are stored in the URL query (?page=3&size=25), so reload and the Back button work
• Out-of-range or invalid page values in the URL are clamped to a valid page
• With zero items, shows an empty state and no controls

Only after every requirement works.

• Jump-to-page input
• Keep the page window the same width as the page changes to avoid layout shift
• Keyboard shortcuts for previous and next