[FEAT-2496] Add Customize fields button in new column menu (#2683)

* feat: add customize-fields btn in new column menu

* fix: refactor onClick

* Add separator

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Co-authored-by: Charles Bochet <charles@twenty.com>

front/src/modules/ui/navigation/menu-item/components/MenuItem.tsx

@@ -39,6 +39,7 @@ export const MenuItem = ({
   const showIconButtons = Array.isArray(iconButtons) && iconButtons.length > 0;
 
   const handleMenuItemClick = (event: MouseEvent<HTMLLIElement>) => {
+    if (!onClick) return;
     event.preventDefault();
     event.stopPropagation();