fix(blog): restore TOC, list styling, and dynamic OG images

This commit reapplies fixes directly to main after reverting an accidental feature branch merge.

chore(release): bump version to 2.2.6

lib/blog.ts

@@ -116,7 +116,7 @@ export async function getPostBySlug(slug: string, locale: string): Promise<PostD
         category: doc.category || '',
         featuredImage:
           typeof doc.featuredImage === 'object' && doc.featuredImage !== null
-            ? doc.featuredImage.url || doc.featuredImage.sizes?.card?.url
+            ? doc.featuredImage.sizes?.card?.url || doc.featuredImage.url
             : null,
         focalX:
           typeof doc.featuredImage === 'object' && doc.featuredImage !== null
@@ -162,7 +162,7 @@ export async function getAllPosts(locale: string): Promise<PostData[]> {
           category: doc.category || '',
           featuredImage:
             typeof doc.featuredImage === 'object' && doc.featuredImage !== null
-              ? doc.featuredImage.url || doc.featuredImage.sizes?.card?.url
+              ? doc.featuredImage.sizes?.card?.url || doc.featuredImage.url
               : null,
           focalX:
             typeof doc.featuredImage === 'object' && doc.featuredImage !== null
@@ -286,3 +286,38 @@ export function getHeadings(content: string): { id: string; text: string; level:
     return { id, text: cleanText, level };
   });
 }
+
+export function extractLexicalHeadings(
+  node: any,
+  headings: { id: string; text: string; level: number }[] = [],
+): { id: string; text: string; level: number }[] {
+  if (!node) return headings;
+
+  if (node.type === 'heading' && node.tag) {
+    const level = parseInt(node.tag.replace('h', ''));
+    const text = getTextContentFromLexical(node);
+    if (text) {
+      headings.push({
+        id: generateHeadingId(text),
+        text,
+        level,
+      });
+    }
+  }
+
+  if (node.children && Array.isArray(node.children)) {
+    node.children.forEach((child: any) => extractLexicalHeadings(child, headings));
+  }
+
+  return headings;
+}
+
+function getTextContentFromLexical(node: any): string {
+  if (node.type === 'text') {
+    return node.text || '';
+  }
+  if (node.children && Array.isArray(node.children)) {
+    return node.children.map(getTextContentFromLexical).join('');
+  }
+  return '';
+}