fix(chat): redirect guests before quota upgrade

src/app/chat/chat-screen.tsx

@@ -49,7 +49,6 @@ export function ChatScreen() {
   const showMessageLimitBanner =
     state.upgradePromptVisible && state.upgradeReason === "daily_limit";
   const messageLimitTitle = "The limit for free chat times\nhas been reached";
-  const messageLimitCta = isGuest ? "Log in to continue chatting" : undefined;
 
   const showPrivatePaywallBanner =
     state.upgradePromptVisible && state.upgradeReason === "private_message";
@@ -142,11 +141,12 @@ export function ChatScreen() {
   }
 
   function handleMessageLimitUnlock(): void {
+    const subscriptionUrl = ROUTE_BUILDERS.subscription("vip");
     if (isGuest) {
-      router.push(ROUTES.auth);
+      router.push(ROUTE_BUILDERS.authWithRedirect(subscriptionUrl));
       return;
     }
-    router.push(ROUTE_BUILDERS.subscription("vip"));
+    router.push(subscriptionUrl);
   }
 
   return (
@@ -186,7 +186,6 @@ export function ChatScreen() {
           {showMessageLimitBanner ? (
             <ChatQuotaExhaustedBanner
               title={messageLimitTitle}
-              ctaLabel={messageLimitCta}
               onUnlock={handleMessageLimitUnlock}
             />
           ) : (