homepage: neon dual-speed ticker + emerald/cyan palette pass

- New DualSpeedTicker component (CSS keyframes, GPU-accelerated,
  pause on hover, 28px rows, 17s BEAT / 40s FORUM, refresh 5min)
- /api/ticker/beat-news: last 7 days from bb.native_articles
- /api/ticker/forum-posts: latest threads + replies interleaved
- Mounted at the bottom of Header so every page gets it
- Scoped .bb-neon palette on homepage root: section heads +
  text-shadow glow, neon-tinted card borders, emerald→cyan button
  gradient, cyan hover state on links, subscribe boxes neon-bordered
- CSS-only — no layout changes

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

src/app/home-page/page.tsx

@@ -130,7 +130,7 @@ function FeedSkeleton() {
 
 export default function HomePage() {
   return (
-    <div className="min-h-screen bg-background">
+    <div className="min-h-screen bg-background bb-neon">
       {/* Sticky top bar + nav */}
       <Header />