fix: override elliptic to patched version for GHSA-848j-6mx2-7j84

Security fix: pins transitive elliptic dependency to >=6.6.1 via pnpm.overrides to address GHSA-848j-6mx2-7j84.

All pipeline gates satisfied:
- CI: passed ✅
- UAT (Pixel Patty): approved ✅ (PRI-717 done)
- QA (Regression Regina): approved ✅ (PRI-707 thread)
- CTO (Null Pointer Nancy): approved ✅ (GitHub review)

Source: PRI-707 / PRI-734

Co-Authored-By: Paperclip <noreply@paperclip.ing>

package.json

@@ -33,7 +33,8 @@
     "tar": "^7.5.11",
     "undici": "^7.24.3",
     "lodash": ">=4.18.0",
-    "vite": ">=6.4.2"
+    "vite": ">=6.4.2",
+    "elliptic": ">=6.6.1"
   },
   "devDependencies": {
     "@headlamp-k8s/eslint-config": "^0.6.0",