Resolve Opus review code findings

upload/frontend/table/on_folder_change.js

@@ -1,14 +1,8 @@
 import { listZipFiles } from '../zip/list_zip_files.js';
 import { addFileWithDedup } from './add_file_with_dedup.js';
+import { rebaseTree } from './rebase_tree.js';
 import { render } from './render.js';
 
-function rebaseTree(root, prefix) {
-  root.path = `${prefix}/${root.path}`;
-  if (root.file) root.file = new File([root.file], root.path, { lastModified: root.file.lastModified });
-  root.children.forEach((child) => rebaseTree(child, prefix));
-  return root;
-}
-
 export function onFolderChange(state, cfg, elements) {
   return async () => {
     if (state.busy) return;