Update @auth/sveltekit to latest stable version 1.10.0

- Upgraded @auth/sveltekit from 0.14.0 to 1.10.0
- Updated session API from event.locals.getSession() to event.locals.auth()
- Fixed TypeScript definitions for new auth API in app.d.ts
- Updated layout server load functions to use LayoutServerLoad type
- Fixed session callbacks with proper token type casting
- Switched to generic OIDC provider config to resolve issuer validation issues
- All auth functionality now working with latest Auth.js version

🤖 Generated with [Claude Code](https://claude.ai/code)

Co-Authored-By: Claude <noreply@anthropic.com>

src/routes/glaube/+layout.svelte

@@ -2,10 +2,6 @@
 import Header from '$lib/components/Header.svelte'
 import UserHeader from '$lib/components/UserHeader.svelte';
 export let data
-let username = ""
-if(data.user){
-	username = data.user.username
-}
 </script>
 <Header>
 	<ul class=site_header slot=links>
@@ -13,6 +9,6 @@ if(data.user){
 	<li><a href="/glaube/rosenkranz">Rosenkranz</a></li>
 	<li><a href="/glaube/predigten">Predigten</a></li>
 	</ul>
-	<UserHeader {username} slot=right_side></UserHeader>
+	<UserHeader user={data.session?.user} slot=right_side></UserHeader>
 	<slot></slot>
 </Header>