Commiting so I don't lose changes, still slighlty buggy on the ordering but other changes have been implemented in ui and dont want to lose them

implemented cell barcode file upload in the UI, and fixed bugs with categorical variables num cells not being 0 if they left all availabe values in avail list and not selected

implemented group by checkbox in ui and improved styling, also fixed variable selection so users can't select same variable twice

fixed default filter bug and reset filters bug from sylivia's preliminary testing of feature  on 03-27-25