feat: browser-side security check

package.json

@@ -15,11 +15,13 @@
   },
   "dependencies": {
     "@types/qrcode": "^1.5.6",
+    "@types/zxcvbn": "^4.4.5",
     "qrcode": "^1.5.4",
     "react": "^19.0.0",
     "react-dom": "^19.0.0",
     "react-router-dom": "^6.28.0",
-    "zustand": "^5.0.2"
+    "zustand": "^5.0.2",
+    "zxcvbn": "^4.4.2"
   },
   "devDependencies": {
     "@testing-library/jest-dom": "^6.6.3",