añadido codigo para el alert de shadcn

src/lib/components/ui/alert/alert-description.svelte

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+<script lang="ts">
+	import type { HTMLAttributes } from "svelte/elements";
+	import { cn, type WithElementRef } from "$lib/utils.js";
+
+	let {
+		ref = $bindable(null),
+		class: className,
+		children,
+		...restProps
+	}: WithElementRef<HTMLAttributes<HTMLDivElement>> = $props();
+</script>
+
+<div
+	bind:this={ref}
+	data-slot="alert-description"
+	class={cn(
+		"text-muted-foreground col-start-2 grid justify-items-start gap-1 text-sm [&_p]:leading-relaxed",
+		className
+	)}
+	{...restProps}
+>
+	{@render children?.()}
+</div>

src/lib/components/ui/alert/alert-title.svelte

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+<script lang="ts">
+	import type { HTMLAttributes } from "svelte/elements";
+	import { cn, type WithElementRef } from "$lib/utils.js";
+
+	let {
+		ref = $bindable(null),
+		class: className,
+		children,
+		...restProps
+	}: WithElementRef<HTMLAttributes<HTMLDivElement>> = $props();
+</script>
+
+<div
+	bind:this={ref}
+	data-slot="alert-title"
+	class={cn("col-start-2 line-clamp-1 min-h-4 font-medium tracking-tight", className)}
+	{...restProps}
+>
+	{@render children?.()}
+</div>

src/lib/components/ui/alert/alert.svelte

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+<script lang="ts" module>
+	import { type VariantProps, tv } from "tailwind-variants";
+
+	export const alertVariants = tv({
+		base: "relative grid w-full grid-cols-[0_1fr] items-start gap-y-0.5 rounded-lg border px-4 py-3 text-sm has-[>svg]:grid-cols-[calc(var(--spacing)*4)_1fr] has-[>svg]:gap-x-3 [&>svg]:size-4 [&>svg]:translate-y-0.5 [&>svg]:text-current",
+		variants: {
+			variant: {
+				default: "bg-card text-card-foreground",
+				destructive:
+					"text-destructive bg-card *:data-[slot=alert-description]:text-destructive/90 [&>svg]:text-current",
+			},
+		},
+		defaultVariants: {
+			variant: "default",
+		},
+	});
+
+	export type AlertVariant = VariantProps<typeof alertVariants>["variant"];
+</script>
+
+<script lang="ts">
+	import type { HTMLAttributes } from "svelte/elements";
+	import { cn, type WithElementRef } from "$lib/utils.js";
+
+	let {
+		ref = $bindable(null),
+		class: className,
+		variant = "default",
+		children,
+		...restProps
+	}: WithElementRef<HTMLAttributes<HTMLDivElement>> & {
+		variant?: AlertVariant;
+	} = $props();
+</script>
+
+<div
+	bind:this={ref}
+	data-slot="alert"
+	class={cn(alertVariants({ variant }), className)}
+	{...restProps}
+	role="alert"
+>
+	{@render children?.()}
+</div>

src/lib/components/ui/alert/index.ts

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+import Root from "./alert.svelte";
+import Description from "./alert-description.svelte";
+import Title from "./alert-title.svelte";
+export { alertVariants, type AlertVariant } from "./alert.svelte";
+
+export {
+	Root,
+	Description,
+	Title,
+	//
+	Root as Alert,
+	Description as AlertDescription,
+	Title as AlertTitle,
+};