add toast when copying url to clipboard

src/entrypoints/popup/components/Toast.svelte

@@ -0,0 +1,13 @@
+<script lang="ts">
+	import { fly } from 'svelte/transition';
+	import { toast } from '@/entrypoints/popup/state';
+</script>
+
+{#if $toast}
+	<div
+		class="absolute top-2 left-1/2 -translate-x-1/2 z-20 px-3 py-1.5 bg-gray-700 text-gray-100 text-sm rounded shadow-lg pointer-events-none"
+		transition:fly={{ y: -20, duration: 200 }}
+	>
+		{$toast.message}
+	</div>
+{/if}