fix(abacus-react): add packages: write permission for GitHub Packages publishing

- Add missing packages: write permission to workflow permissions
- This is required for publishing to GitHub Packages registry
- Should resolve 403 Forbidden permission_denied error

🤖 Generated with [Claude Code](https://claude.ai/code)

Co-Authored-By: Claude <noreply@anthropic.com>

.github/workflows/publish-abacus-react.yml

@@ -12,6 +12,7 @@ permissions:
   contents: write
   issues: write
   pull-requests: write
+  packages: write
   id-token: write
 
 jobs: