feat(About): dark banner section with script quote, signature, and author photo

Two-column layout: left column stacks serif statement above a row of
Caveat quote (flex-1) + 2px golden divider + author bio (shrink-0).
Signature image is absolute-positioned just below the three Caveat lines
(top: 6.44rem = 3 × 32px line-height). Right column is a full-height
overflow-hidden container with object-cover author photo.

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

app/page.tsx

@@ -2,6 +2,7 @@ import { Hero } from "./components/Hero";
 import { Divider } from "./components/Divider";
 import { Tools } from "./components/Tools";
 import { Blog } from "./components/Blog";
+import { About } from "./components/About";
 
 export default function Home() {
   return (
@@ -10,6 +11,7 @@ export default function Home() {
       <Divider />
       <Tools />
       <Blog />
+      <About />
     </main>
   );
 }