fix: remove duplicate site-bg, handle fullscreen promise rejection, unify tooltip language, improve dropdown CSS compat and accessibility

src/app/layout.tsx

@@ -64,7 +64,7 @@ export default async function RootLayout({ children }: { children: ReactNode })
               <TopHeader />
               <SiteHeader />
               <Navigation />
-              <main className="overflow-hidden site-bg">
+              <main className="overflow-hidden">
                 <div className="mx-auto mt-10 grid max-w-7xl grid-cols-12 gap-x-3 gap-y-8 p-6 md:mt-0">
                   <div className="col-span-12">{children}</div>
                 </div>