News hub: add working pagination that respects the type filter

Client-side paginator (9 per page) reusing the site's pagination styling; page numbers with dots for long lists, Previous/Next with disabled states, resets to page 1 on filter change and hides when a single page.

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

en/index.html

@@ -258,7 +258,7 @@
             </div>
         </section>
 
-                <section class="latest-news-section">
+                        <section class="latest-news-section">
             <div class="news-header">
                 <h2>Latest news</h2>
                 <p>What is new at MSOS, from events and projects to blog stories and announcements.</p>

en/news/index.html

@@ -349,6 +349,11 @@
                     </div>
                 </article>
             </div>
+            <nav class="pagination newshub-pagination" data-page-size="9" hidden>
+                <button type="button" class="pagination-arrow" data-nav="prev"><i class="fas fa-arrow-left" aria-hidden="true"></i> Previous</button>
+                <div class="pagination-numbers"></div>
+                <button type="button" class="pagination-arrow" data-nav="next">Next <i class="fas fa-arrow-right" aria-hidden="true"></i></button>
+            </nav>
         </section>
     </main>