about: add Header/Footer to /about/contact + /about/advertise; banners on all three

/about/contact and /about/advertise were rendering bare <main> tags
with no site chrome at all — no header, no footer, no banners. Both
are now wrapped with the standard
  <div className="min-h-screen bg-background"><Header />…<Footer /></div>
shell that the rest of the site uses, which auto-brings the site-wide
728x90 leaderboard with it.

/about/team already had Header+Footer but no in-content banner.

In addition to the header leaderboard, each of the three pages now
also renders one in-content 728x90 banner (gated on
ADS_728X90.length > 0, hidden on mobile to match the header banner's
display rules). This brings the about/* pages in line with the ad
inventory of /show-coverage and the other category landing pages.

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

src/app/about/advertise/page.tsx

@@ -1,7 +1,14 @@
+import Header from "@/components/Header";
+import Footer from "@/components/Footer";
+import AdImage from "@/components/AdImage";
+import { ADS_728X90, shuffle } from "@/lib/ads";
+
 export const metadata = { title: "Advertise — Broadcast Beat" };
 
 export default function AdvertisePage() {
   return (
+    <div className="min-h-screen bg-background">
+      <Header />
       <main className="mx-auto max-w-3xl px-6 py-12 text-[#e5e7eb]">
         <h1 className="font-serif text-4xl font-bold tracking-tight mb-2">Advertise on Broadcast Beat</h1>
         <p className="text-sm text-[#9ca3af] mb-10">
@@ -24,6 +31,13 @@ export default function AdvertisePage() {
           </ul>
         </section>
 
+        {/* In-content 728x90 banner (live example of the leaderboard unit) */}
+        {ADS_728X90.length > 0 && (
+          <div className="my-10 hidden md:flex justify-center" aria-label="Advertisement">
+            <AdImage ad={shuffle(ADS_728X90)[0]} page="advertise" />
+          </div>
+        )}
+
         <section className="mb-10">
           <h2 className="font-mono text-xs uppercase tracking-wider text-[#6b7280] mb-3">Reporting</h2>
           <p className="text-[15px] text-[#d1d5db]">
@@ -41,5 +55,7 @@ export default function AdvertisePage() {
           </p>
         </section>
       </main>
+      <Footer />
+    </div>
   );
 }

src/app/about/contact/page.tsx

@@ -1,7 +1,14 @@
+import Header from "@/components/Header";
+import Footer from "@/components/Footer";
+import AdImage from "@/components/AdImage";
+import { ADS_728X90, shuffle } from "@/lib/ads";
+
 export const metadata = { title: "Contact — Broadcast Beat" };
 
 export default function ContactPage() {
   return (
+    <div className="min-h-screen bg-background">
+      <Header />
       <main className="mx-auto max-w-2xl px-6 py-12 text-[#e5e7eb]">
         <h1 className="font-serif text-4xl font-bold tracking-tight mb-6">Contact</h1>
         <dl className="space-y-5 text-[15px]">
@@ -25,6 +32,15 @@ export default function ContactPage() {
             <dd>Ryan Salazar · <a className="text-[var(--color-text-info,#60a5fa)] hover:underline" href="mailto:ryan.salazar@relevantmediaproperties.com">ryan.salazar@relevantmediaproperties.com</a></dd>
           </div>
         </dl>
+
+        {/* In-content 728x90 banner */}
+        {ADS_728X90.length > 0 && (
+          <div className="mt-12 hidden md:flex justify-center" aria-label="Advertisement">
+            <AdImage ad={shuffle(ADS_728X90)[0]} page="contact" />
+          </div>
+        )}
       </main>
+      <Footer />
+    </div>
   );
 }

src/app/about/team/page.tsx

@@ -1,6 +1,8 @@
 import { createClient } from "@supabase/supabase-js";
 import Header from "@/components/Header";
 import Footer from "@/components/Footer";
+import AdImage from "@/components/AdImage";
+import { ADS_728X90, shuffle } from "@/lib/ads";
 
 export const dynamic = "force-dynamic";
 export const revalidate = 600;
@@ -66,6 +68,13 @@ export default async function TeamPage() {
             </li>
           ))}
         </ul>
+
+        {/* In-content 728x90 banner */}
+        {ADS_728X90.length > 0 && (
+          <div className="mt-12 hidden md:flex justify-center" aria-label="Advertisement">
+            <AdImage ad={shuffle(ADS_728X90)[0]} page="team" />
+          </div>
+        )}
       </main>
       <Footer />
     </div>