Implement Bulk Actions for CSS Classes

Currently, managing multiple CSS classes in the editor can be time-consuming, especially when tasks like renaming, duplicating, or deleting need to be performed across many classes at once. Introducing bulk actions would provide a much more efficient workflow. Proposed Actions: * Generate New: Takes all ID-level rules, class-rules and put them into a newly generated class. * Delete: Remove multiple selected classes in one action. ** This could be done with a dedicated CLI Command like "del(.class_name1, .class_name2)" -> submit -> shift+mouse click to repeat the deletion on selected elements. Benefits: * Time-Saving: Drastically reduces the time spent on repetitive class management tasks. * Efficiency: Streamlines the styling workflow, allowing developers to focus on design rather than administrative tasks.