correctly pass anonymousid to the auth modal in the root route

src/routes/stats/+page.svelte

@@ -24,6 +24,7 @@
 
 	let { data }: { data: PageData } = $props();
 	let authModalOpen = $state(false);
+	let anonymousId = $state("");
 
 	let loading = $state(true);
 
@@ -39,6 +40,7 @@
 	}
 
 	onMount(async () => {
+		anonymousId = getOrCreateAnonymousId();
 		loading = false;
 	});
 
@@ -412,4 +414,4 @@
 	</div>
 </div>
 
-<AuthModal bind:isOpen={authModalOpen} anonymousId="" />
+<AuthModal bind:isOpen={authModalOpen} {anonymousId} />