vite

* replace next with vite
* disable strictmode (it interferes with collaboration in dev mode)

client/src/features/page/tree/atoms/tree-api-atom.ts

@@ -0,0 +1,5 @@
+import { atom } from "jotai";
+import { TreeApi } from 'react-arborist';
+import { TreeNode } from "../types";
+
+export const treeApiAtom = atom<TreeApi<TreeNode> | null>(null);