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/menus/CollectionMenu.tsx

@@ -63,7 +63,6 @@ function CollectionMenu({
   const handleExport = React.useCallback(() => {
     dialogs.openModal({
       title: t("Export collection"),
-      isCentered: true,
       content: (
         <ExportDialog
           collection={collection}