Cleanup, add tests and storybook

tests/components/RelatedArticles.test.tsx

@@ -43,6 +43,10 @@ const mockPosts: BlogPost[] = [
       author: "Author",
       date: "2025-04-10",
     },
+    content: "",
+    htmlContent: "",
+    filePath: "article-1.md",
+    lastModified: new Date("2025-04-10"),
   },
   {
     slug: "article-2",
@@ -52,6 +56,10 @@ const mockPosts: BlogPost[] = [
       author: "Author",
       date: "2025-04-11",
     },
+    content: "",
+    htmlContent: "",
+    filePath: "article-2.md",
+    lastModified: new Date("2025-04-11"),
   },
 ];