Add Economist-style tagline to news articles

Co-authored-by: pethers <1726836+pethers@users.noreply.github.com>

Author: Copilot

scripts/article-template.js

@@ -323,6 +323,7 @@ ${ALL_LANG_CODES.map(l => `  <link rel="alternate" hreflang="${l === 'no' ? 'nb'
      No embedded CSS needed - promotes consistency and maintainability. -->
 <article class="news-article">
   <header class="article-header">
+    <div class="site-tagline">Latest news and analysis from Sweden's Riksdag. The Economist-style political journalism covering parliament, government, and agencies with systematic transparency.</div>
     <h1>${title}</h1>
     <div class="article-meta">
       <time datetime="${isoDate}">${formattedDate}</time>

styles.css

@@ -9035,3 +9035,15 @@ body.news-page {
     display: none;
   }
 }
+
+/* Site Tagline for News Articles */
+.news-article .site-tagline {
+  font-size: 0.85rem;
+  color: var(--text-secondary, #6c757d);
+  text-transform: uppercase;
+  letter-spacing: 0.5px;
+  margin-bottom: 1rem;
+  padding-bottom: 0.75rem;
+  border-bottom: 1px solid var(--border-color, #e9ecef);
+  font-weight: 500;
+}