chore: purge shadcn from codebase. Replace with bits-ui components and other tools

src/widgets/ComparisonView/ui/Sidebar/Sidebar.svelte

@@ -5,12 +5,12 @@
     Content (font list, controls) is injected via snippets.
 -->
 <script lang="ts">
-import { cn } from '$shared/shadcn/utils/shadcn-utils';
 import {
     ButtonGroup,
     Label,
     ToggleButton,
 } from '$shared/ui';
+import clsx from 'clsx';
 import type { Snippet } from 'svelte';
 import {
     type Side,
@@ -40,7 +40,7 @@ let {
 </script>
 
 <div
-    class={cn(
+    class={clsx(
         'flex flex-col h-full',
         'w-80',
         'bg-surface dark:bg-dark-bg',