fix(home): restore homepage event banner styling

The .event-banner rules were dropped during an _event.css rewrite, so the
homepage promo banner rendered unstyled (full-width dark text, no gradient).
Restored the banner styles and removed the em-dash from the banner copy.

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

si/index.html

@@ -216,7 +216,7 @@
             <div class="event-banner-inner">
                 <div class="event-banner-copy">
                     <span class="event-banner-tag"><i class="fas fa-bullhorn" aria-hidden="true"></i> Prihajajoči dogodek</span>
-                    <p class="event-banner-text"><strong>Spoznaj študentsko Slovenijo 2026</strong> &middot; Petek, 4. september, NLB Banka, Skopje in prenos v živo &mdash; za bodoče študente in njihove starše.</p>
+                    <p class="event-banner-text"><strong>Spoznaj študentsko Slovenijo 2026</strong> &middot; Petek, 4. september, NLB Banka, Skopje in prenos v živo, za bodoče študente in njihove starše.</p>
                 </div>
                 <a class="btn btn-primary-orange event-banner-cta" href="../si/news/meet-student-slovenia-2026/">Izvedi več in se prijavi</a>
             </div>