fix(splash): reuse latest chat message preview

src/app/chat/chat-screen.tsx

@@ -35,6 +35,7 @@ import { useChatUnlockNavigationFlow } from "./hooks/use-chat-unlock-navigation-
 import { useChatGuestLogin } from "./hooks/use-chat-guest-login";
 import { useChatMessageLimitBanner } from "./hooks/use-chat-message-limit-banner";
 import { useChatPromotionBootstrap } from "./hooks/use-chat-promotion-bootstrap";
+import { useSplashLatestMessageSync } from "./hooks/use-splash-latest-message-sync";
 
 const chatShellStyle = {
   "--chat-message-font-size": "clamp(16px, 3.333vw, 18px)",
@@ -47,6 +48,11 @@ export function ChatScreen() {
   const state = useChatState();
   const authState = useAuthState();
   const authDispatch = useAuthDispatch();
+  useSplashLatestMessageSync({
+    historyLoaded: state.historyLoaded,
+    loginStatus: authState.loginStatus,
+    messages: state.historyMessages,
+  });
   const isPromotionBootstrapReady = useChatPromotionBootstrap();
   const visibleMessages = isPromotionBootstrapReady
     ? state.messages