Pixiportal

As an administrator, I want to control an application's availability, so that only active applications are accessible.

Acceptance Criteria:
Deactivation
The administrator can deactivate an application; it immediately disappears from the catalog visible to users.

Reactivation
The administrator can reactivate a deactivated application; it becomes visible again to users who have access.

Confirmation
A confirmation is requested before deactivation, and a success message is shown afterward.