chore: replace sonner with sileo

src/lib/components/ui/sileo/sileo-toast.svelte

@@ -0,0 +1,21 @@
+<script lang="ts">
+	import { createElement } from 'react'
+	import { createRoot } from 'react-dom/client'
+	import type { SileoOptions } from 'sileo'
+
+	let props: SileoOptions = $props()
+	let rootEl: HTMLElement
+
+	$effect(() => {
+		const root = createRoot(rootEl)
+
+		import('sileo').then(({ Toaster }) => {
+			const sileo = createElement(Toaster, { ...props })
+			root.render(sileo)
+		})
+
+		return () => root.unmount()
+	})
+</script>
+
+<div bind:this={rootEl}></div>