SEO polish: OG image, favicons, 404, article schema, image optimization

- Add branded 1200x630 og-default.jpg; article pages use their hero as
  og:image, others use the default
- Wire the existing (previously unlinked) favicon set into every page
- Add branded 404.html with root-absolute paths + noindex
- Emit Article + localized BreadcrumbList JSON-LD on all article pages
- Convert 74 heavy served photos to WebP (28MB -> 8.5MB, -70%), rewrite
  references, add loading=lazy/decoding=async to below-fold images and
  fetchpriority=high to heroes (protect LCP)
- Stop tracking images/original/ (458MB of unused source masters; kept on
  disk, gitignored) and ignore .playwright-mcp/

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

en/projects/in-memory-of-frosina-kulakova/index.html

@@ -16,15 +16,22 @@
     <meta property="og:title" content="In Memory of Frosina Kulakova - MSOS">
     <meta property="og:description" content="On February 8, 2025, Macedonian students in Ljubljana gathered for a peaceful public event to honor the memory of Frosina Kulakova, who tragically lost her…">
     <meta property="og:url" content="https://msosorg.com/en/projects/in-memory-of-frosina-kulakova/">
-    <meta property="og:image" content="https://msosorg.com/images/frosina-1.png">
+    <meta property="og:image" content="https://msosorg.com/images/frosina-1.webp">
     <meta property="og:locale" content="en_GB">
     <meta property="og:locale:alternate" content="mk_MK">
     <meta property="og:locale:alternate" content="sl_SI">
     <meta name="twitter:card" content="summary_large_image">
     <meta name="twitter:title" content="In Memory of Frosina Kulakova - MSOS">
     <meta name="twitter:description" content="On February 8, 2025, Macedonian students in Ljubljana gathered for a peaceful public event to honor the memory of Frosina Kulakova, who tragically lost her…">
-    <meta name="twitter:image" content="https://msosorg.com/images/frosina-1.png">
+    <meta name="twitter:image" content="https://msosorg.com/images/frosina-1.webp">
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+    <script type="application/ld+json">{"@context":"https://schema.org","@type":"Article","headline":"In Memory of Frosina Kulakova","description":"On February 8, 2025, Macedonian students in Ljubljana gathered for a peaceful public event to honor the memory of Frosina Kulakova, who tragically lost her…","image":"https://msosorg.com/images/frosina-1.webp","inLanguage":"en","author":{"@type":"Organization","name":"Macedonian Student Organisation in Slovenia","url":"https://msosorg.com/en/"},"publisher":{"@type":"Organization","name":"Macedonian Student Organisation in Slovenia","logo":{"@type":"ImageObject","url":"https://msosorg.com/images/1-logo.png"}},"mainEntityOfPage":"https://msosorg.com/en/projects/in-memory-of-frosina-kulakova/"}</script>
+    <script type="application/ld+json">{"@context":"https://schema.org","@type":"BreadcrumbList","itemListElement":[{"@type":"ListItem","position":1,"name":"Home","item":"https://msosorg.com/en/"},{"@type":"ListItem","position":2,"name":"Events & projects","item":"https://msosorg.com/en/projects/"},{"@type":"ListItem","position":3,"name":"In Memory of Frosina Kulakova","item":"https://msosorg.com/en/projects/in-memory-of-frosina-kulakova/"}]}</script>
+    <link rel="icon" type="image/png" href="/favicon-96x96.png" sizes="96x96">
+    <link rel="icon" type="image/svg+xml" href="/favicon.svg">
+    <link rel="shortcut icon" href="/favicon.ico">
+    <link rel="apple-touch-icon" sizes="180x180" href="/apple-touch-icon.png">
+    <link rel="manifest" href="/site.webmanifest">
     <!-- SEO:END -->
     <!-- Google Fonts -->
     <link rel="preconnect" href="https://fonts.googleapis.com">
@@ -173,14 +180,14 @@
             </header>
 
             <figure class="article-main-image">
-                <img src="../../../images/frosina-1.png" alt="Candles and flowers in memory of Frosina Kulakova">
+                <img fetchpriority="high" src="../../../images/frosina-1.webp" alt="Candles and flowers in memory of Frosina Kulakova">
             </figure>
 
             <div class="article-body">
                 <p>The news of Frosina’s tragic passing on January 29, 2025, deeply shook students across Slovenia. Even though we are far from home, the pain was shared, and the need to come together was clear. Out of this feeling grew the initiative to organize a peaceful public gathering in Ljubljana, where young people could unite, light candles, lay flowers, and dedicate a moment of silence in her memory.</p>
 
                 <figure class="article-inline-image">
-                    <img src="../../../images/frosina-2.png" alt="Students lighting candles in memory of Frosina">
+                    <img loading="lazy" decoding="async" src="../../../images/frosina-2.webp" alt="Students lighting candles in memory of Frosina">
                 </figure>
 
                 <h2>A message of unity</h2>
@@ -190,7 +197,7 @@
                 <p>By standing side by side in moments like these, we learn that our strength lies not only in our studies and ambitions but also in our ability to support one another when it matters most.</p>
 
                 <figure class="article-inline-image">
-                    <img src="../../../images/frosina-3.png" alt="Flowers and candles laid in remembrance">
+                    <img loading="lazy" decoding="async" src="../../../images/frosina-3.webp" alt="Flowers and candles laid in remembrance">
                 </figure>
 
                 <h2>Closing thoughts</h2>
@@ -225,7 +232,7 @@
         <div class="footer-main">
             <div class="footer-info">
                 <div class="footer-logo">
-                    <img src="../../../images/13-whitelogo.png" alt="Macedonian Student Organisation in Slovenia Logo">
+                    <img loading="lazy" decoding="async" src="../../../images/13-whitelogo.png" alt="Macedonian Student Organisation in Slovenia Logo">
                 </div>
                 <p class="footer-legal-name">Društvo Makedonska Študentska Organizacija v Sloveniji za študentsko podporo in kulturno sodelovanje</p>
                 <p>