fix(frontend): avoid using route new as thread id

frontend/src/components/workspace/messages/message-list-item.tsx

@@ -1,6 +1,5 @@
 import type { Message } from "@langchain/langgraph-sdk";
 import { FileIcon, Loader2Icon } from "lucide-react";
-import { useParams } from "next/navigation";
 import { memo, useMemo, type ImgHTMLAttributes } from "react";
 import rehypeKatex from "rehype-katex";
 
@@ -39,10 +38,12 @@ export function MessageListItem({
   className,
   message,
   isLoading,
+  threadId,
 }: {
   className?: string;
   message: Message;
   isLoading?: boolean;
+  threadId: string;
 }) {
   const isHuman = message.type === "human";
   return (
@@ -54,6 +55,7 @@ export function MessageListItem({
         className={isHuman ? "w-fit" : "w-full"}
         message={message}
         isLoading={isLoading}
+        threadId={threadId}
       />
       {!isLoading && (
         <MessageToolbar
@@ -111,21 +113,22 @@ function MessageContent_({
   className,
   message,
   isLoading = false,
+  threadId,
 }: {
   className?: string;
   message: Message;
   isLoading?: boolean;
+  threadId: string;
 }) {
   const rehypePlugins = useRehypeSplitWordsIntoSpans(isLoading);
   const isHuman = message.type === "human";
-  const { thread_id } = useParams<{ thread_id: string }>();
   const components = useMemo(
     () => ({
       img: (props: ImgHTMLAttributes<HTMLImageElement>) => (
-        <MessageImage {...props} threadId={thread_id} maxWidth="90%" />
+        <MessageImage {...props} threadId={threadId} maxWidth="90%" />
       ),
     }),
-    [thread_id],
+    [threadId],
   );
 
   const rawContent = extractContentFromMessage(message);
@@ -151,8 +154,8 @@ function MessageContent_({
   }, [rawContent, isHuman]);
 
   const filesList =
-    files && files.length > 0 && thread_id ? (
-      <RichFilesList files={files} threadId={thread_id} />
+    files && files.length > 0 ? (
+      <RichFilesList files={files} threadId={threadId} />
     ) : null;
 
   // Uploading state: mock AI message shown while files upload

frontend/src/components/workspace/messages/message-list.tsx

@@ -63,6 +63,7 @@ export function MessageList({
                   key={`${group.id}/${msg.id}`}
                   message={msg}
                   isLoading={thread.isLoading}
+                  threadId={threadId}
                 />
               );
             });