Bump version to 2.1.0 for upcoming feature enhancements

package.json

@@ -1,6 +1,6 @@
 {
   "name": "modern-spelling-practice",
-  "version": "2.0.0",
+  "version": "2.1.0",
   "description": "A modern, multi-user spelling practice application with admin controls, customizable themes, and analytics",
   "main": "server.js",
   "scripts": {