feat: add proper marketing footer with privacy/terms links

- marketing/components/footer.tsx: multi-column footer with product,
  resources, and legal columns — Privacy Policy clearly linked on homepage
  (satisfies Google OAuth consent screen requirement)
- Replaces thin single-line footer in layout.tsx

Co-authored-by: Cursor <cursoragent@cursor.com>

app/(marketing)/layout.tsx

@@ -2,6 +2,7 @@ import { Button } from "@/components/ui/button";
 import Link from "next/link";
 import type { Metadata } from "next";
 import { homepage } from "@/marketing/content/homepage";
+import { Footer } from "@/marketing/components";
 
 export const metadata: Metadata = {
   title: homepage.meta.title,
@@ -86,39 +87,7 @@ export default function MarketingLayout({
       {/* Main Content */}
       <main className="flex-1 w-full">{children}</main>
 
-      {/* Footer */}
-      <footer className="border-t py-8 md:py-0">
-        <div className="container flex flex-col items-center justify-between gap-4 md:h-24 md:flex-row">
-          <div className="flex flex-col items-center gap-4 px-8 md:flex-row md:gap-2 md:px-0">
-            <p className="text-center text-sm leading-loose text-muted-foreground md:text-left">
-              © {new Date().getFullYear()} Vib&apos;n. Built by{" "}
-              <a
-                href="https://github.com/MawkOne"
-                target="_blank"
-                rel="noreferrer"
-                className="font-medium underline underline-offset-4"
-              >
-                Mark Henderson
-              </a>
-              {" "}· Victoria, BC, Canada
-            </p>
-          </div>
-          <nav className="flex items-center gap-6 text-sm text-muted-foreground">
-            <Link href="/privacy" className="hover:text-foreground transition-colors">
-              Privacy Policy
-            </Link>
-            <Link href="/terms" className="hover:text-foreground transition-colors">
-              Terms of Service
-            </Link>
-            <a
-              href="mailto:legal@vibnai.com"
-              className="hover:text-foreground transition-colors"
-            >
-              Contact
-            </a>
-          </nav>
-        </div>
-      </footer>
+      <Footer />
     </div>
   );
 }