style: final consistency pass — theme, responsive, animations

app/not-found.tsx

@@ -8,7 +8,7 @@ export default function NotFound() {
       <div className="text-center">
         <p className="font-mono text-sm text-ink-soft mb-4">404</p>
         <h1 className="font-sans text-4xl font-bold tracking-tight text-ink mb-4">Page not found</h1>
-        <p className="text-ink-soft mb-8">The page you're looking for doesn't exist.</p>
+        <p className="text-ink-soft mb-8">The page you{`'`}re looking for doesn{`'`}t exist.</p>
         <Link href="/" className="inline-block rounded-lg bg-ink px-6 py-3 text-sm font-medium text-canvas hover:opacity-80 transition-opacity">
           Go home
         </Link>