fix sveltekit load / preload bug on logout

frontend/src/lib/components/Sidebar.svelte

@@ -68,10 +68,19 @@
 
 	<div class="sidebar-footer">
 		{#each footerItems as item}
+			{#if item.href === '/logout'}
+				<form method="POST" action="/logout" class="nav-item-form">
+					<button type="submit" class="nav-item nav-item-button" aria-label="Log out">
+						{@html item.icon}
+						<span class="nav-label">{item.label}</span>
+					</button>
+				</form>
+			{:else}
 				<a href={item.href} class="nav-item">
 					{@html item.icon}
 					<span class="nav-label">{item.label}</span>
 				</a>
+			{/if}
 		{/each}
 	</div>
 </aside>
@@ -143,6 +152,18 @@
 		background: #3730a3;
 		color: #e0e7ff;
 	}
+	.nav-item-form {
+		margin: 0 0.3rem;
+	}
+	.nav-item-button {
+		font-family: inherit;
+		background: none;
+		border: none;
+		box-sizing: border-box;
+		text-align: left;
+		cursor: pointer;
+		width: 100%;
+	}
 	.nav-item.active {
 		background: #4338ca;
 		color: #fff;

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; }
+	.error-page {
-	h1 { font-size: 1.5rem; color: #111827; margin-bottom: 0.5rem; }
+		max-width: 480px;
-	p { color: #6b7280; }
+		margin: 4rem auto;
-	.hint { margin-top: 1.5rem; font-size: 0.9rem; }
+		text-align: center;
-	a { color: #6366f1; }
+		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);