update: more visual consistency

src/lib/components/ui/theme-toggle/ThemeToggle.svelte

@@ -1,6 +1,5 @@
 <script lang="ts">
 	import { themeStore } from '$lib/stores/theme.svelte';
-	import { Button } from '$lib/components/ui/button';
 	import { Sun, Moon, Monitor } from 'lucide-svelte';
     import IconButton from '../IconButton.svelte';
 
@@ -17,7 +16,7 @@
 	}
 </script>
 
-<IconButton onclick={toggle} {size} {color}>
+<IconButton onclick={toggle} {size} {color} rounded="md">
 	{#if themeStore.current === 'light'}
 		<Sun size={20} />
 		<span class="sr-only">Light mode (click for dark)</span>