Initial migration to Svelte5 via full syntax compatability

- updated all dependencies
- removed svelte-chartjs wrapper from dependencies
- sveltestrap causes compilation warnings (once)
- Header.svelte uses new Svelte5 syntax as example
- fixed most initial compilation warnings except circular dependencies with TBD cause

web/frontend/src/header.entrypoint.js

@@ -1,10 +1,11 @@
-import Header from './Header.svelte'
+import { mount } from 'svelte';
+import Header from './Header.svelte';
 
-const headerDomTarget = document.getElementById('svelte-header')
+const headerDomTarget = document.getElementById('svelte-header');
 
 if (headerDomTarget != null) {
-    new Header({
+    mount(Header, {
         target: headerDomTarget,
         props: { ...header },
-    })
+    });
 }