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

src/shared/shadcn/ui/sheet/sheet-header.svelte

@@ -0,0 +1,20 @@
+<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<HTMLDivElement>> = $props();
+</script>
+
+<div
+    bind:this={ref}
+    data-slot="sheet-header"
+    class={cn('flex flex-col gap-1.5 p-4', className)}
+    {...restProps}
+>
+    {@render children?.()}
+</div>