fix: Hide Applications tab when offline or unsupported

The Applications tab is now rendered only when the device is online
and supports container management.

This aligns the tab with the behavior of other tabs and avoids
confusing users when containers are unavailable or the device lacks
the required capabilities.

Signed-off-by: Omar <omar.brbutovic@secomind.com>

Author: OmarBrbutovic

frontend/src/components/DeviceTabs/ApplicationsTab.tsx

@@ -1,7 +1,7 @@
 /*
  * This file is part of Edgehog.
  *
- * Copyright 2025 SECO Mind Srl
+ * Copyright 2025 - 2026 SECO Mind Srl
  *
  * Licensed under the Apache License, Version 2.0 (the "License");
  * you may not use this file except in compliance with the License.
@@ -42,6 +42,7 @@ const DEVICE_DEPLOYED_APPLICATIONS_FRAGMENT = graphql`
     device(id: $id) {
       id
       online
+      capabilities
       systemModel {
         name
       }
@@ -76,7 +77,7 @@ const DeviceApplicationsTab = ({ deviceRef }: DeviceApplicationsTabProps) => {
     };
   }, [handleRefetch]);
 
-  if (!device) {
+  if (!device || !device.capabilities.includes("CONTAINER_MANAGEMENT")) {
     return null;
   }