fix: add elliptic override for GHSA-848j-6mx2-7j84

Add pnpm.overrides.elliptic to prevent version regression on
the transitive elliptic vulnerability (CVE-2025-14505).

Vulnerability path:
@kinvolk/headlamp-plugin → vite-plugin-node-polyfills →
node-stdlib-browser → crypto-browserify → browserify-sign → elliptic

Note: pnpm audit will still report the vulnerability until
upstream publishes elliptic 6.6.2+. This override safeguards
against pulling a worse version.

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

package.json

@@ -38,7 +38,8 @@
       "flatted": "^3.4.2",
       "lodash": ">=4.18.0",
       "picomatch": ">=4.0.4",
-      "vite": ">=6.4.2"
+      "vite": ">=6.4.2",
+      "elliptic": ">=6.6.1"
     }
   },
   "devDependencies": {