Fix blog excerpt rendering: remove shortcodes and decode HTML entities

- Add decodeExcerptEntities() to handle —, …, smart quotes, etc.
- Add removeShortcodes() to strip [caption] and other WordPress shortcodes
- Regenerate blog-posts.json and pages.json with cleaned excerpts

Fixes issue where [caption] tags and raw HTML entities appeared in blog listings.

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

frontend/scripts/parse-squarespace-xml.js

@@ -119,10 +119,52 @@ function cleanContent(html) {
   return clean;
 }
 
+// Decode HTML entities for excerpts
+function decodeExcerptEntities(text) {
+  return text
+    // Common HTML entities
+    .replace(/—/g, '—')
+    .replace(/–/g, '–')
+    .replace(/…/g, '...')
+    .replace(/’/g, "'")
+    .replace(/‘/g, "'")
+    .replace(/”/g, '"')
+    .replace(/“/g, '"')
+    .replace(/ /g, ' ')
+    .replace(/&/g, '&')
+    .replace(/&lt;/g, '<')
+    .replace(/&gt;/g, '>')
+    .replace(/&quot;/g, '"')
+    .replace(/&#39;/g, "'")
+    .replace(/&#8217;/g, "'")
+    .replace(/&#8216;/g, "'")
+    .replace(/&#8220;/g, '"')
+    .replace(/&#8221;/g, '"')
+    .replace(/&#8212;/g, '—')
+    .replace(/&#8211;/g, '–')
+    .replace(/&#8230;/g, '...');
+}
+
+// Remove WordPress-style shortcodes
+function removeShortcodes(text) {
+  // Remove [caption]...[/caption] shortcodes
+  let clean = text.replace(/\[caption[^\]]*\](.*?)\[\/caption\]/gi, '$1');
+  // Remove other common shortcodes
+  clean = clean.replace(/\[\/?[a-z_]+[^\]]*\]/gi, '');
+  return clean;
+}
+
 // Extract first paragraph as excerpt
 function extractExcerpt(content, maxLength = 200) {
+  // First decode HTML entities in the raw content
+  let text = decodeExcerptEntities(content);
+  // Remove WordPress shortcodes
+  text = removeShortcodes(text);
   // Remove HTML tags
-  const text = content.replace(/<[^>]+>/g, ' ').replace(/\s+/g, ' ').trim();
+  text = text.replace(/<[^>]+>/g, ' ');
+  // Clean up whitespace
+  text = text.replace(/\s+/g, ' ').trim();
+
   if (text.length <= maxLength) return text;
   return text.substring(0, maxLength).replace(/\s+\S*$/, '') + '...';
 }