add copy button for sharing vorgang

src/routes/(token-based)/list/[vorgang]/+page.svelte

@@ -129,11 +129,24 @@
 			return;
 		}
 	}
+
+	async function setClipboard(text) {
+		const type = "text/plain";
+		const clipboardItemData = {
+			[type]: text,
+		};
+		const clipboardItem = new ClipboardItem(clipboardItemData);
+		await navigator.clipboard.write([clipboardItem]);
+	}
 </script>
 
 <div class="-z-10 bg-white">
 	<div class="flex flex-col items-center justify-center w-full">
 		<h1 class="text-xl">Vorgang {vorg.name}</h1>
+		{#if data?.user?.admin}
+		Zugangspasswort: {vorg.pw}
+		<Button on:click={() => setClipboard($page.url.toString().split('?')[0])}>Copy Link</Button>
+		{/if}
 	</div>
 	<div class="mx-auto flex justify-center max-w-7xl h-full">
 		<ul class="divide-y divide-gray-100">