Add USB policy improvements and emprestimos details modal

- Add cron job to cleanup stale pending USB policies every 30 min
- Add cleanupStalePendingPolicies mutation to usbPolicy.ts
- Add USB policy fields to machines listByTenant query
- Display USB status chip in device details and bulk control modal
- Add details modal for emprestimos with all loan information
- Add observacoesDevolucao field to preserve original observations
- Fix status text size in details modal title

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude <noreply@anthropic.com>

convex/crons.ts

@@ -25,4 +25,12 @@ if (autoPauseCronEnabled) {
   )
 }
 
+// Cleanup de policies USB pendentes por mais de 1 hora (sem flag, sempre ativo)
+crons.interval(
+  "cleanup-stale-usb-policies",
+  { minutes: 30 },
+  api.usbPolicy.cleanupStalePendingPolicies,
+  {}
+)
+
 export default crons