feature: add necessary shadcn components for CategoryFilter and Sidebar

src/shared/ui/sidebar/sidebar-content.svelte

@@ -0,0 +1,24 @@
+<script lang="ts">
+    import { cn, type WithElementRef } from '$shared/utils/shadcn-utils.js';
+import type { HTMLAttributes } from 'svelte/elements';
+
+let {
+    ref = $bindable(null),
+    class: className,
+    children,
+    ...restProps
+}: WithElementRef<HTMLAttributes<HTMLElement>> = $props();
+</script>
+
+<div
+    bind:this={ref}
+    data-slot="sidebar-content"
+    data-sidebar="content"
+    class={cn(
+        'flex min-h-0 flex-1 flex-col gap-2 overflow-auto group-data-[collapsible=icon]:overflow-hidden',
+        className,
+    )}
+    {...restProps}
+>
+    {@render children?.()}
+</div>