fix: refresh only export jobs list on Aktualisieren, not the whole page

frontend/src/routes/admin/+page.svelte

@@ -70,6 +70,17 @@
 		}
 	}
 
+	let exportJobsRefreshing = $state(false);
+
+	async function refreshExportJobs() {
+		exportJobsRefreshing = true;
+		try {
+			exportJobs = await api.get<ExportJob[]>('/admin/export/jobs');
+		} finally {
+			exportJobsRefreshing = false;
+		}
+	}
+
 	function showToast(msg: string) {
 		toast = msg;
 		setTimeout(() => (toast = null), 3000);
@@ -225,7 +236,9 @@
 			<div class="rounded-xl border border-gray-200 bg-white p-5">
 				<div class="mb-4 flex items-center justify-between">
 					<h2 class="font-semibold text-gray-900">Export-Jobs</h2>
-					<button onclick={reload} class="text-xs text-blue-600 hover:underline">Aktualisieren</button>
+					<button onclick={refreshExportJobs} disabled={exportJobsRefreshing} class="text-xs text-blue-600 hover:underline disabled:opacity-50">
+						{exportJobsRefreshing ? 'Lädt…' : 'Aktualisieren'}
+					</button>
 				</div>
 				{#if exportJobs.length === 0}
 					<p class="text-sm text-gray-400">Noch keine Export-Jobs.</p>