feat: add version polling and auto-reload on deploy

- Enable kit.version.pollInterval (60s) so SvelteKit detects new
  deploys via version.json
- Add beforeNavigate guard that forces a full page reload when a
  new version is detected, preventing stale client-side state
- Preload fonts, JS, and CSS for faster initial paint

web/src/hooks.server.ts

@@ -54,5 +54,7 @@ export const handle: Handle = async ({ event, resolve }) => {
 		}
 	}
 
-	return resolve(event);
+	return resolve(event, {
+		preload: ({ type }) => type === 'font' || type === 'js' || type === 'css'
+	});
 };

web/src/routes/+layout.svelte

@@ -3,6 +3,8 @@
 	import Header from '$lib/components/layout/Header.svelte';
 	import Footer from '$lib/components/layout/Footer.svelte';
 	import { page } from '$app/stores';
+	import { updated } from '$app/stores';
+	import { beforeNavigate } from '$app/navigation';
 	import type { Snippet } from 'svelte';
 
 	interface Props {
@@ -13,6 +15,12 @@
 	let { data, children }: Props = $props();
 
 	const canonicalUrl = $derived(`https://marktvogt.de${$page.url.pathname}`);
+
+	beforeNavigate(({ willUnload, to }) => {
+		if ($updated && !willUnload && to?.url) {
+			location.href = to.url.href;
+		}
+	});
 </script>
 
 <svelte:head>

web/svelte.config.js

@@ -3,7 +3,10 @@ import adapter from '@sveltejs/adapter-node';
 /** @type {import('@sveltejs/kit').Config} */
 const config = {
 	kit: {
-		adapter: adapter()
+		adapter: adapter(),
+		version: {
+			pollInterval: 60_000
+		}
 	}
 };