feature: enable file renaming

Users can now rename a file by double-clicking on it.

frontend/components/editor/sidebar/file.tsx

@@ -90,9 +90,9 @@ export default function SidebarFile({
           if (!editing && !pendingDelete && !isMoving)
             selectFile({ ...data, saved: true });
         }}
-        // onDoubleClick={() => {
-        //   setEditing(true)
-        // }}
+        onDoubleClick={() => {
+          setEditing(true)
+        }}
         className={`${
           dragging ? "opacity-50 hover:!bg-background" : ""
         } data-[state=open]:bg-secondary/50 w-full flex items-center h-7 px-1 hover:bg-secondary rounded-sm cursor-pointer transition-colors focus-visible:outline-none focus-visible:ring-1 focus-visible:ring-ring`}