Remove duplicate featured images from blog content

- Add removeLeadingImage() to strip the first image from content when it matches
  the featured image, preventing duplication on blog post pages
- Handles figure wraps, linked images, and standalone img tags
- Featured image now appears only once (in the header), not repeated in content

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

frontend/scripts/parse-squarespace-xml.js

@@ -195,6 +195,36 @@ function removeShortcodes(text) {
   return clean;
 }
 
+// Remove the first/leading image from content to avoid duplication with featured image
+function removeLeadingImage(content, featuredImageUrl) {
+  if (!featuredImageUrl || !content) return content;
+
+  let result = content.trim();
+
+  // Pattern 1: Remove leading <figure class="wp-caption">...</figure> containing the featured image
+  const figureMatch = result.match(/^(\s*<figure[^>]*>[\s\S]*?<\/figure>\s*)/i);
+  if (figureMatch && figureMatch[1].includes(featuredImageUrl.split('?')[0])) {
+    result = result.substring(figureMatch[1].length).trim();
+    return result;
+  }
+
+  // Pattern 2: Remove leading <a><img></a> containing the featured image
+  const linkedImgMatch = result.match(/^(\s*<a[^>]*>[\s\S]*?<img[^>]*>[\s\S]*?<\/a>\s*)/i);
+  if (linkedImgMatch && linkedImgMatch[1].includes(featuredImageUrl.split('?')[0])) {
+    result = result.substring(linkedImgMatch[1].length).trim();
+    return result;
+  }
+
+  // Pattern 3: Remove leading standalone <img> containing the featured image
+  const imgMatch = result.match(/^(\s*<img[^>]*\/?>[\s*]*)/i);
+  if (imgMatch && imgMatch[1].includes(featuredImageUrl.split('?')[0])) {
+    result = result.substring(imgMatch[1].length).trim();
+    return result;
+  }
+
+  return result;
+}
+
 // Extract first paragraph as excerpt
 function extractExcerpt(content, maxLength = 200) {
   // First decode HTML entities in the raw content
@@ -230,7 +260,9 @@ items.forEach((item, index) => {
   const slug = createSlug(postName, title);
   const images = extractImages(content);
   const featuredImage = images[0] || null;
-  const cleanedContent = cleanContent(content);
+  let cleanedContent = cleanContent(content);
+  // Remove the leading image from content if it matches the featured image (to avoid duplication)
+  cleanedContent = removeLeadingImage(cleanedContent, featuredImage);
   const excerpt = extractExcerpt(cleanedContent);
 
   const data = {