Add temporary Sentry test button (dev/test only)

Co-authored-by: Junie <junie@jetbrains.com>

src/components/RootLayout.tsx

@@ -1,6 +1,7 @@
 import type { ReactNode } from 'react';
 import { Nav } from './Nav';
 import { Footer } from './Footer';
+import { SentryTestButton } from './SentryTestButton';
 
 export function RootLayout({ children }: { children: ReactNode }) {
   return (
@@ -8,6 +9,7 @@ export function RootLayout({ children }: { children: ReactNode }) {
       <Nav />
       {children}
       <Footer />
+      <SentryTestButton />
     </div>
   );
 }