style: Minor Beta UI fixes (#1197)

* style(Header): hide scrollbar but still allow side scroll/swipe/drag/touch

* feat: make menu buttons flexiblewith min-width, delete passed in classes, add pointer-cursor

* refactor: use conditional for visibility of plugins settings

* fix: make advanced settings popover appear over nav

* refactor(textarea): minor padding restyling, add max height

* style: make menuItem checkmark invisible instead of hidden so it takes up width space

* style: make presetsMenu trigger an icon button, remove max-width of presets except in mobile view

* style: improve advanced settings mobile styling

* feat: newchat and convo items toggle nav on small screens

* style: improve no presets view

* style: make sure toggle hover effect does not apply on smaller screens

client/src/components/Chat/Menus/UI/MenuItem.tsx

@@ -81,7 +81,7 @@ const MenuItem: FC<MenuItemProps> = ({
               viewBox="0 0 24 24"
               fill="none"
               xmlns="http://www.w3.org/2000/svg"
-              className="icon-md block hidden gap-x-1 group-hover:flex "
+              className="icon-md invisible block gap-x-1 group-hover:visible group-hover:flex"
             >
               <path
                 fillRule="evenodd"