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

src/widgets/ComparisonView/ui/Thumb/Thumb.svelte

@@ -4,7 +4,7 @@
     1px red vertical rule with square handles at top and bottom.
 -->
 <script lang="ts">
-import { cn } from '$shared/shadcn/utils/shadcn-utils';
+import clsx from 'clsx';
 import { cubicOut } from 'svelte/easing';
 import { fade } from 'svelte/transition';
 
@@ -31,7 +31,7 @@ let { sliderPos, isDragging }: Props = $props();
 >
     <!-- Top handle -->
     <div
-        class={cn(
+        class={clsx(
             'w-5 h-5 md:w-6 md:h-6',
             '-ml-2.5 md:-ml-3',
             'mt-2 md:mt-4',
@@ -47,7 +47,7 @@ let { sliderPos, isDragging }: Props = $props();
 
     <!-- Bottom handle -->
     <div
-        class={cn(
+        class={clsx(
             'w-5 h-5 md:w-6 md:h-6',
             '-ml-2.5 md:-ml-3',
             'mb-2 md:mb-4',