Refactor Sidebar component by removing unused folder icon and cleaning up code

Frontend/src/components/Sidebar.jsx

@@ -75,21 +75,6 @@ const Sidebar = ({
                     </svg>
                   )}
                 </span>
-                <span className="folder-icon">
-                  <svg
-                    xmlns="http://www.w3.org/2000/svg"
-                    width="16"
-                    height="16"
-                    viewBox="0 0 24 24"
-                    fill="none"
-                    stroke="#75beff"
-                    strokeWidth="2"
-                    strokeLinecap="round"
-                    strokeLinejoin="round"
-                  >
-                    <path d="M22 19a2 2 0 0 1-2 2H4a2 2 0 0 1-2-2V5a2 2 0 0 1 2-2h5l2 3h9a2 2 0 0 1 2 2z"></path>
-                  </svg>
-                </span>
                 <span className="folder-name">{name}</span>
               </div>
               {isExpanded && (
@@ -184,7 +169,6 @@ const Sidebar = ({
       </div>
     );
   };
-
   const getFileIcon = (fileName) => {
     const extension = fileName.split('.').pop().toLowerCase();