feat: replace clsx with cn util

src/shared/ui/Stat/StatGroup.svelte

@@ -3,8 +3,8 @@
     Renders multiple Stat components in a row with auto-separators.
 -->
 <script lang="ts">
+import { cn } from '$shared/lib';
 import { Stat } from '$shared/ui';
-import clsx from 'clsx';
 import type { ComponentProps } from 'svelte';
 
 interface StatItem extends Partial<Pick<ComponentProps<typeof Stat>, 'variant'>> {
@@ -26,7 +26,7 @@ interface Props {
 let { stats, class: className }: Props = $props();
 </script>
 
-<div class={clsx('flex items-center gap-4', className)}>
+<div class={cn('flex items-center gap-4', className)}>
     {#each stats as stat, i}
         <Stat
             label={stat.label}