feat(ui): 单文件时文件标题居中

frontend/src/components/workspace/artifacts/artifact-file-detail.tsx

@@ -236,7 +236,7 @@ export function ArtifactFileDetail({
         <div className="flex min-w-0 grow items-center justify-center">
           <ArtifactTitle>
             {isWriteFile ? (
-              <div className=" w-full overflow-hidden text-ellipsis whitespace-nowrap px-2">{truncateMiddle(getFileName(filepath), 50)}</div>
+              <div className=" w-full text-center overflow-hidden text-ellipsis whitespace-nowrap px-2">{truncateMiddle(getFileName(filepath), 50)}</div>
             ) : (
               <DropdownSelector
                 value={filepath}