chore: do new design mockup

src/lib/components/ui/alert-dialog/alert-dialog-overlay.svelte

@@ -0,0 +1,19 @@
+<script lang="ts">
+	import { AlertDialog as AlertDialogPrimitive } from "bits-ui";
+	import { cn } from "$lib/utils.js";
+
+	let {
+		ref = $bindable(null),
+		class: className,
+		...restProps
+	}: AlertDialogPrimitive.OverlayProps = $props();
+</script>
+
+<AlertDialogPrimitive.Overlay
+	bind:ref
+	class={cn(
+		"data-[state=open]:animate-in data-[state=closed]:animate-out data-[state=closed]:fade-out-0 data-[state=open]:fade-in-0  fixed inset-0 z-50 bg-black/80",
+		className
+	)}
+	{...restProps}
+/>