refactor: migrate to Svelte 5

use runes ($props, $state, $derived, $effect, etc)

apps/website/src/components/Analytics.svelte

@@ -1,6 +1,11 @@
 <script lang="ts">
-    export let domain: string
-    export let enabled = !import.meta.env.DEV
+    let {
+        domain,
+        enabled = !import.meta.env.DEV,
+    }: {
+        domain: string
+        enabled?: boolean
+    } = $props()
 </script>
 
 <svelte:head>