feat: replace clsx with cn util

src/shared/ui/Footnote/Footnote.svelte

@@ -3,7 +3,7 @@
     Provides classes for styling footnotes
 -->
 <script lang="ts">
-import clsx from 'clsx';
+import { cn } from '$shared/lib';
 import type { Snippet } from 'svelte';
 
 interface Props {
@@ -26,14 +26,14 @@ const { children, class: className, render }: Props = $props();
 
 {#if render}
     {@render render({
-    class: clsx(
+    class: cn(
         'font-mono text-3xs sm:text-2xs lowercase tracking-wider-mono text-text-soft',
         className,
     ),
 })}
 {:else if children}
     <span
-        class={clsx(
+        class={cn(
             'font-mono text-3xs sm:text-2xs lowercase tracking-wider-mono text-text-soft',
             className,
         )}