Refactor collection creation UI (#6485)

* Iteration, before functional component

* Use react-hook-form, shared form for new and edit

* Avoid negative margin on input prefix

* Centered now default for modals

app/scenes/Settings/components/FileOperationListItem.tsx

@@ -76,7 +76,6 @@ const FileOperationListItem = ({ fileOperation }: Props) => {
 
   const handleConfirmDelete = React.useCallback(async () => {
     dialogs.openModal({
-      isCentered: true,
       title: t("Are you sure you want to delete this import?"),
       content: (
         <ConfirmationDialog