Add "Uncategorized" Group to Card View

[kompowiec]

Currently, the app includes an "All" group, which allows users to view all cards regardless of their assigned category. However, there is no option to view cards that have not been assigned to any category.

As a user, I would like to have a "Uncategorized" group added to the card view. This feature would be particularly useful when adding new cards, as it would allow me to easily identify and view only those cards that have not yet been categorized.

This enhancement would streamline the card organization process and improve overall user experience by ensuring that uncategorized cards are easily accessible and manageable.