feat(file input): adding feature to add and remove files

Next up is to create a seperate menu that will show all the files.
Probably as a seperate frame. Needs to be scrollable and can use similar
ui as before

web-app/src/components/ui/button/down-button.jsx

@@ -6,7 +6,7 @@ export default function DownButton({ onClick }) {
   return (
     <motion.button
       onClick={onClick}
-      className="bg-gray-700 p-2 rounded-2xl"
+      className="bg-gray-700 p-2 rounded-2xl file-input border-2 border-gray-600"
       whileHover={{ scale: 1.1 }}
       whileTap={{ scale: 0.9 }}
     >