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Problem with this button is that it renders before state update that's why I use useEffect for checking state whenever it change

const [theme, setTheme] = useState(() => {
return document.documentElement.classList.contains('dark') ? 'dark' : 'light';
});

In this code, I give the default value of the theme by checking from HTML document classist

here I useEffect for rerendring whenever userchange theme and I update theme from toggle theme
in useEffect, basically change the theme of page using dom manupulation.
useEffect(() => {
const htmlElement = document.documentElement;
if (theme === 'dark') {
htmlElement.classList.add('dark');
htmlElement.classList.remove('light');
} else {
htmlElement.classList.add('light');
htmlElement.classList.remove('dark');
}
}, [theme]);
here this it basic toggle theme button that will toggle the value of theme
function toggleTheme() {
setTheme((prevTheme) => (prevTheme === 'dark' ? 'light' : 'dark'));
}
I hope u understand.

below there is scrrenshot of logs.

here u can see logs are totally perfect