content(mss-2026): add sponsor logo + event banners, update venue to NLB branch

- Add Capital Asset Management sponsor logo (images/partners/capital.png),
  replacing the plain-text sponsor name in the event partners row.
- Set the in-article hero to the clean event banner (mss-2026-hero.webp) and
  the News/homepage listing cards to the sponsor-strip promo variant
  (mss-2026-card.webp) via a new front-matter `card:` field.
- Update the venue everywhere (event page key info + prose + confirmation
  text, and the homepage promo banner) to
  "НЛБ експозитура, локација East Gate Mall, Скопје" (EN: NLB branch;
  SI: poslovalnica NLB), across all three languages.

Build tooling: build_content emits an optional data-card on the hero <img>;
build_listings prefers data-card as the listing thumbnail so the card can
differ from the in-article hero. Rebuilt news pages, listings and search index.

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

en/index.html

@@ -213,7 +213,7 @@
             <div class="event-banner-inner">
                 <div class="event-banner-copy">
                     <span class="event-banner-tag"><i class="fas fa-bullhorn" aria-hidden="true"></i> Upcoming event</span>
-                    <p class="event-banner-text"><strong>Meet Student Slovenia 2026</strong> &middot; Friday, 4 September, NLB Banka, Skopje &amp; live stream, for future students and their parents.</p>
+                    <p class="event-banner-text"><strong>Meet Student Slovenia 2026</strong> &middot; Friday, 4 September, NLB branch, East Gate Mall, Skopje &amp; live stream, for future students and their parents.</p>
                 </div>
                 <a class="btn btn-primary-orange event-banner-cta" href="../en/news/meet-student-slovenia-2026/">Learn more &amp; register</a>
             </div>
@@ -320,7 +320,7 @@
 <!-- AUTO-LATEST-NEWS:START -->
                 <article class="news-card" data-type="news">
                     <a class="news-card-media" href="/en/news/meet-student-slovenia-2026/">
-                        <img width="1920" height="1280" src="/images/event4-img-1.webp" alt="Students and speakers at the Meet Student Slovenia event in Skopje" loading="lazy">
+                        <img width="1920" height="1080" src="/images/mss-2026-card.webp" alt="Meet Student Slovenia 2026 promo banner — NLB branch, East Gate Mall, Skopje, 4 September 2026" loading="lazy">
                         <span class="news-badge news-badge--news"><i class="fas fa-bullhorn" aria-hidden="true"></i> News</span>
                     </a>
                     <div class="card-content">