Frontend: Add "No Label" / "No category" / "No area" Filter for entities, devices, scripts etc.

[prorun26]

Description
Currently, Home Assistant allows filtering entities, devices, automations, scripts, etc., based on assigned labels, categories, and areas. However, there is no option to filter objects that have no label, category, or area assigned. This feature would be useful for identifying and organizing unclassified entities more efficiently.

Proposed Feature
Add a “No Label” filter option in management views (Entities, Devices, Automations, Scripts, etc.).
When selected, only objects (entities, devices, automations, scripts, etc.) without a label should be displayed.
The same functionality should be available for categories and areas.

Use Case
Helps users quickly find entities that have not been categorized with labels.
Useful for cleaning up and structuring entity lists, especially in large Home Assistant setups.

Implementation Suggestion
Extend the existing label filter logic to include a “No Label” condition as a selectable option.