fix(lint): resolve prettier and dot-notation errors

apps/web/src/hooks/useChat.ts

@@ -280,12 +280,9 @@ export function useChat(options: UseChatOptions = {}): UseChatReturn {
         }
 
         // Streaming failed - check if auth error, try guest mode
-        const isAuthError =
+        const isAuthError = err instanceof Error && 
-          err instanceof Error &&
+          (err.message.includes("403") || err.message.includes("401") || 
-          (err.message.includes("403") ||
+           err.message.includes("auth") || err.message.includes("Forbidden"));
-            err.message.includes("401") ||
-            err.message.includes("auth") ||
-            err.message.includes("Forbidden"));
 
         if (isAuthError) {
           console.warn("Auth failed, trying guest chat mode");