Fix/cicd build 129

[pope-h]

Summary

Fix CI/CD pipeline build failures by:

1. Making the GitHub Actions client-generation summary check resilient to log format differences.
2. Fixing a frontend ESLint failure in Settings.tsx caused by passing an async function directly to onClick.
3. Declaring the repo package manager for consistent tooling.

Changes

CI (GitHub Actions)

• Update .github/workflows/build.yml so the “Check client generation summary” step:
  • Uses the last matched Failed: N value when present
  • Defaults to 0 when the pattern is missing
  • Avoids bash numeric comparison errors on empty values

Frontend (Lint)

• Update frontend/src/pages/Settings.tsx:
  • Replace onClick={handleSave} with onClick={() => void handleSave()} to satisfy @typescript-eslint/no-misused-promises

Tooling

• Add packageManager field to package.json to make package manager choice explicit.

How to verify

• GitHub Actions: run the Build Project and Run Tests workflow on this PR.
• Locally (optional):
  • cd frontend && npm ci --legacy-peer-deps
  • npm run lint

closes #100