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/components/Header.tsx

@@ -18,6 +18,7 @@ import LanguageSwitcher from "@/components/LanguageSwitcher";
 import AdImage from "@/components/AdImage";
 import EventsDropdown from "@/components/EventsDropdown";
 import AboutDropdown from "@/components/AboutDropdown";
+import DualSpeedTicker from "@/components/DualSpeedTicker";
 import { ADS_728X90, shuffle } from "@/lib/ads";
 
 interface NavItem {
@@ -644,6 +645,7 @@ export default function Header() {
           </div>
         </div>
       </div>
+      <DualSpeedTicker />
     </>
   );
 }