feat: save user theme preference

inertia/components/common/theme_switcher.tsx

@@ -1,13 +1,22 @@
 import { ActionIcon, useMantineColorScheme } from '@mantine/core';
 import { TbMoonStars, TbSun } from 'react-icons/tb';
+import { makeRequest } from '~/lib/request';
 
 export function MantineThemeSwitcher() {
 	const { colorScheme, toggleColorScheme } = useMantineColorScheme();
+	const handleThemeChange = () => {
+		toggleColorScheme();
+		makeRequest({
+			url: '/user/theme',
+			method: 'POST',
+			body: { theme: colorScheme === 'dark' ? 'light' : 'dark' },
+		});
+	};
 	return (
 		<ActionIcon
 			variant="light"
 			aria-label="Toggle color scheme"
-			onClick={() => toggleColorScheme()}
+			onClick={handleThemeChange}
 			size="lg"
 		>
 			{colorScheme === 'dark' ? <TbSun /> : <TbMoonStars />}