Add zxcvbn dependency to package.json

Added the zxcvbn library to dependencies for password strength estimation.

Author: DongDuong2001

package.json

@@ -74,7 +74,8 @@
     "tailwind-merge": "^2.5.5",
     "tailwindcss-animate": "^1.0.7",
     "vaul": "^0.9.9",
-    "zod": "3.25.76"
+    "zod": "3.25.76",
+    "zxcvbn": "^4.4.2"
   },
   "devDependencies": {
     "@tailwindcss/postcss": "^4.1.9",