CCF: Multi-select deletion for activities

From now on, activities in the CCF report can be deleted in bulk within a category using multi-select checkboxes.

Before deletion, a confirmation dialog is shown. After confirmation, the selected activities are removed and no longer included in the CCF calculation. They are permanently deleted when the report is saved and can be restored via “Undo” until then.

Detailed instructions on how to use the multi-select deletion function can be found here.