refactor: remove all legacy files

+ comment/delete things that haven't yet migrated to mantine

inertia/components/common/theme_switcher.tsx

@@ -0,0 +1,16 @@
+import { ActionIcon, useMantineColorScheme } from '@mantine/core';
+import { TbMoonStars, TbSun } from 'react-icons/tb';
+
+export function MantineThemeSwitcher() {
+	const { colorScheme, toggleColorScheme } = useMantineColorScheme();
+	return (
+		<ActionIcon
+			variant="light"
+			aria-label="Toggle color scheme"
+			onClick={() => toggleColorScheme()}
+			size="lg"
+		>
+			{colorScheme === 'dark' ? <TbSun /> : <TbMoonStars />}
+		</ActionIcon>
+	);
+}