Update to svelte 5

svelte/src/layout/TextBlock.svelte

@@ -1,10 +1,17 @@
-<script>
-export let width = "750px"
-export let center = false
+<script lang="ts">
+let {
+	width = "750px",
+	center = false,
+	children
+}: {
+	width?: string;
+	center?: boolean;
+	children?: import('svelte').Snippet;
+} = $props();
 </script>
 
 <div class="block" class:center style="width: {width};">
-	<slot></slot>
+	{@render children?.()}
 </div>
 
 <style>