fix sveltekit load / preload bug on logout

frontend/src/routes/[fam]/+error.svelte

@@ -6,13 +6,44 @@
 <div class="error-page">
 	<h1>Something went wrong</h1>
 	<p>{error?.message || 'An unexpected error occurred.'}</p>
-	<p class="hint">Try <a href="/logout">logging out</a> and signing in again.</p>
+	<div class="hint">
+		Try
+		<form method="POST" action="/logout" class="inline-form">
+			<button type="submit" class="link-button">logging out</button>
+		</form>
+		and signing in again.
+	</div>
 </div>
 
 <style>
-	.error-page { max-width: 480px; margin: 4rem auto; text-align: center; padding: 2rem; }
-	h1 { font-size: 1.5rem; color: #111827; margin-bottom: 0.5rem; }
-	p { color: #6b7280; }
-	.hint { margin-top: 1.5rem; font-size: 0.9rem; }
-	a { color: #6366f1; }
+	.error-page {
+		max-width: 480px;
+		margin: 4rem auto;
+		text-align: center;
+		padding: 2rem;
+	}
+	h1 {
+		font-size: 1.5rem;
+		color: #111827;
+		margin-bottom: 0.5rem;
+	}
+	p {
+		color: #6b7280;
+	}
+	.hint {
+		margin-top: 1.5rem;
+		font-size: 0.9rem;
+	}
+	.inline-form {
+		display: inline-block;
+	}
+	.link-button {
+		background: none;
+		border: none;
+		padding: 0;
+		font: inherit;
+		color: #6366f1;
+		text-decoration: underline;
+		cursor: pointer;
+	}
 </style>

frontend/src/routes/logout/+page.server.ts

@@ -6,11 +6,6 @@ function signOut(event: { cookies: any }) {
 	clearLegacyCookies(event.cookies);
 }
 
-export function load(event) {
-	signOut(event);
-	throw redirect(303, '/');
-}
-
 export const actions = {
 	default: (event) => {
 		signOut(event);