fix: add error handling to meetings + verband dashboard pages

SSR pages crash with 500 when Supabase queries fail (expired session,
network issues). Now catch errors and render with empty data instead
of crashing the entire page.

apps/web/app/[locale]/home/[account]/verband/page.tsx

@@ -22,7 +22,14 @@ export default async function VerbandPage({ params }: PageProps) {
   if (!acct) return <AccountNotFound />;
 
   const api = createVerbandApi(client);
-  const stats = await api.getDashboardStats(acct.id);
+
+  let stats = { totalClubs: 0, totalMembers: 0, totalRoles: 0, totalFeeTypes: 0 };
+
+  try {
+    stats = await api.getDashboardStats(acct.id);
+  } catch (e) {
+    console.error('Failed to load verband dashboard:', e);
+  }
 
   return (
     <CmsPageShell account={account} title="Verbandsverwaltung">