Installed zod, because I somehow didin't have to do that locally

- Also use v4

usentrycoach.client/src/ChatClient/ChatControl.tsx

@@ -1,6 +1,6 @@
 import {useState, useRef, useEffect} from 'react';
 import useLoginToken from "../Hooks/useLoginToken.tsx";
-import { z } from 'zod';
+import { z } from 'zod/v4';
 
 function SessionActive({stopSession} : {stopSession: () => void})
 {