sweep :fix this issue 

in layout.tsx 
move those lines to a new component and put 'use client ' line in first line of this file 
then import it in layout.tsx




import React, { useState } from 'react';



  const [theme, setTheme] = useState('light');

  const toggleTheme = () => {
    setTheme(theme === 'light' ? 'dark' : 'light');
  };


          <button onClick={toggleTheme}>Toggle Theme</button>
      