Brand cleanup: swap remaining user-facing BB strings + accent blue → AV orange

Hit pages we didn't get the first pass: rss, gear, show-coverage,
articles/[slug], contributor, manufacturers, login, client-login, terms,
dashboard/show-calendar, and team-page derive helpers (domain + comment).

src/app/client-login/page.tsx

@@ -62,7 +62,7 @@ export default function ClientLoginPage() {
     <div className="min-h-screen bg-gradient-to-br from-blue-50 to-indigo-100 flex items-center justify-center p-4">
       <div className="bg-white rounded-lg shadow-xl p-8 w-full max-w-md">
         <div className="mb-8">
-          <h1 className="text-3xl font-bold text-gray-900 mb-2">Broadcast Beat</h1>
+          <h1 className="text-3xl font-bold text-gray-900 mb-2">AV Beat</h1>
           <p className="text-gray-600">Contributor Portal</p>
         </div>