Feature request for the Template management interface.

Current behavior:
In Data Collection → Templates, the list shows all templates, without distinguishing those that are actually linked to hosts from those unused.

Request:
Add a toggle or filter option (e.g. "Show only used templates") that displays only the templates assigned to at least one host.

Benefits:

• Reduces visual noise when a large number of templates exists.
• Makes it easier to identify active vs. unused/legacy templates.
• Helps with template maintenance and cleanup.