feat: replace clsx with cn util

src/entities/Font/ui/FontApplicator/FontApplicator.svelte

@@ -4,7 +4,7 @@
     Shows the skeleton snippet while loading; falls back to system font if no skeleton is provided.
 -->
 <script lang="ts">
-import clsx from 'clsx';
+import { cn } from '$shared/lib';
 import type { Snippet } from 'svelte';
 import {
     DEFAULT_FONT_WEIGHT,
@@ -61,7 +61,7 @@ const shouldReveal = $derived(status === 'loaded' || status === 'error');
 {:else}
     <div
         style:font-family={shouldReveal ? `'${font.name}'` : 'system-ui, -apple-system, sans-serif'}
-        class={clsx(className)}
+        class={cn(className)}
     >
         {@render children?.()}
     </div>