feat(Blog): add blog section with featured + secondary post cards

Fine 1px #d9d9d9 border with rounded-xl on all cards. Featured card
uses overflow-hidden to clip thumbnail flush left; secondary cards give
each thumbnail its own rounded-xl so it sits neatly inside the py-2
padded wrapper. Arrow uses standard → instead of unsupported U+1F816.

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

app/page.tsx

@@ -1,6 +1,7 @@
 import { Hero } from "./components/Hero";
 import { Divider } from "./components/Divider";
 import { Tools } from "./components/Tools";
+import { Blog } from "./components/Blog";
 
 export default function Home() {
   return (
@@ -8,6 +9,7 @@ export default function Home() {
       <Hero />
       <Divider />
       <Tools />
+      <Blog />
     </main>
   );
 }