Add confirmation popup util

src/lib/components/Catalog.svelte

@@ -1,10 +1,18 @@
 <script lang="ts">
 	import { catalog } from '$lib/catalog';
+	import { Button } from 'flowbite-svelte';
 	import CatalogItem from './CatalogItem.svelte';
+	import { promptConfirmation } from '$lib/util';
+	import { db } from '$lib/catalog/db';
+
+	function onClear() {
+		promptConfirmation('Are you sure you want to clear your catalog?', () => db.catalog.clear());
+	}
 </script>
 
 {#if $catalog}
 	{#if $catalog.length > 0}
+		<Button outline color="red" class="float-right" on:click={onClear}>Clear catalog</Button>
 		<div class="container">
 			{#each $catalog as { manga }}
 				<CatalogItem {manga} />