phase 1 and 2 of embedded images

frontend/src/app/stories/[id]/page.tsx

@@ -120,18 +120,30 @@ export default function StoryReadingPage() {
 
         // Sanitize story content and add IDs to headings
         const sanitized = await sanitizeHtml(storyData.contentHtml || '');
-        
-        // Parse and add IDs to headings for TOC functionality
-        const parser = new DOMParser();
-        const doc = parser.parseFromString(sanitized, 'text/html');
-        const headings = doc.querySelectorAll('h1, h2, h3, h4, h5, h6');
-        
-        headings.forEach((heading, index) => {
-          heading.id = `heading-${index}`;
-        });
-        
-        setSanitizedContent(doc.body.innerHTML);
-        setHasHeadings(headings.length > 0);
+
+        // Add IDs to headings for TOC functionality using regex instead of DOMParser
+        // This avoids potential browser-specific sanitization that might strip src attributes
+        let processedContent = sanitized;
+        const headingMatches = processedContent.match(/<h[1-6][^>]*>/gi);
+        let headingCount = 0;
+
+        if (headingMatches) {
+          processedContent = processedContent.replace(/<h([1-6])([^>]*)>/gi, (match, level, attrs) => {
+            const headingId = `heading-${headingCount++}`;
+
+            // Check if id attribute already exists
+            if (attrs.includes('id=')) {
+              // Replace existing id
+              return match.replace(/id=['"][^'"]*['"]/, `id="${headingId}"`);
+            } else {
+              // Add id attribute
+              return `<h${level}${attrs} id="${headingId}">`;
+            }
+          });
+        }
+
+        setSanitizedContent(processedContent);
+        setHasHeadings(headingCount > 0);
 
         // Load series stories if part of a series
         if (storyData.seriesId) {