feature: move all shadcn related code to src/shared/shadcn

src/shared/shadcn/ui/sidebar/sidebar-menu-sub.svelte

@@ -0,0 +1,25 @@
+<script lang="ts">
+    import { cn, type WithElementRef } from '$shared/shadcn/utils/shadcn-utils.js';
+import type { HTMLAttributes } from 'svelte/elements';
+
+let {
+    ref = $bindable(null),
+    class: className,
+    children,
+    ...restProps
+}: WithElementRef<HTMLAttributes<HTMLUListElement>> = $props();
+</script>
+
+<ul
+    bind:this={ref}
+    data-slot="sidebar-menu-sub"
+    data-sidebar="menu-sub"
+    class={cn(
+        'border-sidebar-border mx-3.5 flex min-w-0 translate-x-px flex-col gap-1 border-s px-2.5 py-0.5',
+        'group-data-[collapsible=icon]:hidden',
+        className,
+    )}
+    {...restProps}
+>
+    {@render children?.()}
+</ul>