Deploy-1 fix + P0-6/7/8: Suspense wrap, carousel arrows, banner reposition, search-box removal

Deploy-1 build failed because NewsPageClient now calls useSearchParams.
- src/app/news/page.tsx: wrap NewsPageClient in <Suspense> so static
  generation can bail out to client rendering cleanly.

P0-6 (Featured carousel arrows):
- FeaturedBento: brighten arrow buttons (text-[#ccc] over bg-[#1a1a1a]
  with #3a3a3a border; previously near-invisible #666 over the same
  background), enlarge to w-8 h-8, hover fills to blue. Wrap the
  arrow group with role/aria + Left/Right keyboard nav.

P0-7 (728x90 reposition):
- Header: move the leaderboard block from above the main nav to AFTER
  the sticky nav, so it sits between the nav and The Beat ticker.

P0-8 (remove Latest search box):
- ArticleFeed: drop the in-section search input + clear button. The
  top-right header search is now the sole search UI. searchQuery state
  remains since the active-filter chip code still references it.

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

src/app/news/page.tsx

@@ -1,4 +1,5 @@
 import type { Metadata } from "next";
+import { Suspense } from "react";
 import NewsPageClient from "./NewsPageClient";
 import { getLegacyArticlesBySection } from "@/lib/articles/legacy-source";
 
@@ -13,5 +14,10 @@ export const metadata: Metadata = {
 
 export default async function NewsPage() {
   const articles = await getLegacyArticlesBySection("news", 200);
-  return <NewsPageClient articles={articles} />;
+  // Suspense boundary required because NewsPageClient uses useSearchParams.
+  return (
+    <Suspense fallback={null}>
+      <NewsPageClient articles={articles} />
+    </Suspense>
+  );
 }