feat: replace clsx with cn util

src/widgets/ComparisonView/ui/Header/Header.svelte

@@ -5,6 +5,7 @@
 <script lang="ts">
 import { ThemeSwitch } from '$features/ChangeAppTheme';
 import type { ResponsiveManager } from '$shared/lib';
+import { cn } from '$shared/lib';
 import {
     Divider,
     IconButton,
@@ -15,7 +16,6 @@ import {
 } from '$shared/ui';
 import PanelLeftClose from '@lucide/svelte/icons/panel-left-close';
 import PanelLeftOpen from '@lucide/svelte/icons/panel-left-open';
-import clsx from 'clsx';
 import { getContext } from 'svelte';
 import { comparisonStore } from '../../model';
 
@@ -48,7 +48,7 @@ const fontBName = $derived(comparisonStore.fontB?.name ?? '');
 </script>
 
 <header
-    class={clsx(
+    class={cn(
         'flex items-center justify-between',
         'px-4 md:px-8 py-4 md:py-6',
         'h-16 md:h-20 z-20',