fix(front): update vulnerable npm packages (#455)

## 📝 Description
- Update billboard.js from 3.9.3 to 3.16.0 to fix CVE-2025-49223
(critical prototype pollution vulnerability)
- Update d3-color from 1.4.1 to 3.1.0 to fix GHSA-36jr-mh4h-2g58 (high
severity ReDoS vulnerability)

## ✅ Checklist
- [x] I have tested this change
- [x] ~This change requires documentation update~

Author: radwo

front/assets/package-lock.json

@@ -24,12 +24,13 @@
     "@trevoreyre/autocomplete": "^2.1.1",
     "@types/markdown-it": "^14.1.2",
     "ajv": "^8.17.1",
-    "billboard.js": "^3.9.3",
+    "billboard.js": "^3.16.0",
     "brace": "^0.11.1",
     "codemirror": "^5.64.0",
     "cron-parser": "^2.16.3",
     "cronstrue": "^1.100.0",
     "d3": "^7.4.4",
+    "d3-color": "^3.1.0",
     "d3-time-format": "^2.1.3",
     "dagre-d3": "github:dagrejs/dagre-d3#v0.6.4",
     "dedent": "1.5.3",