Fix Docker frontend hydration under CSP

Render the app shell dynamically so Next can attach per-request CSP nonces to its production scripts, preventing Docker from serving a static shell that cannot hydrate. Also gives the first-contact warmup test enough time in CI.

frontend/src/app/layout.tsx

@@ -8,6 +8,8 @@ export const metadata: Metadata = {
   description: 'Advanced Geopolitical Risk Dashboard',
 };
 
+export const dynamic = 'force-dynamic';
+
 export default function RootLayout({
   children,
 }: Readonly<{