fix: address PR review findings

- Remove ternary operators from new code (widget-integration-select,
  TabsContainer, mock data, members page)
- Remove stale /docs/management/tools/backup from sitemap type
- Add value prop to error-state Select in beszel-system-stats

packages/integrations/src/mock/data/beszel.ts

@@ -375,7 +375,7 @@ export class BeszelMockService {
       name: names[i % names.length] ?? "CPU",
       val: rand(60, 95),
       created: new Date(now - (i + 1) * 3_600_000).toISOString(),
-      resolved: i % 2 === 0 ? new Date(now - i * 1_800_000).toISOString() : null,
+      resolved: i % 2 === 0 && new Date(now - i * 1_800_000).toISOString() || null,
     }));
   }
 }