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>

si/index.html

@@ -261,7 +261,7 @@
             </div>
         </section>
 
-                <section class="latest-news-section">
+                        <section class="latest-news-section">
             <div class="news-header">
                 <h2>Najnovejše novice</h2>
                 <p>Kaj je novega pri MSOS, od dogodkov in projektov do blog zgodb in obvestil.</p>