Restore strict frontend CI build checks in Build & Docker Verification

[Copilot]

The Build & Docker Verification job was failing due to frontend warnings being escalated to errors in CI. The workflow had been temporarily configured to bypass this behavior, which masked real compile/lint regressions in the build stage.

• Problem addressed

  • Removed the CI warning-suppression workaround from the frontend production build step so the job reflects actual build health.

• Workflow change

  • Updated .github/workflows/ci.yml to run npm run build under normal CI semantics (no CI=false override).

• Net effect

  • The pipeline now correctly fails when frontend warnings/errors would break production builds, instead of silently passing that stage.

- name: Compile Frontend Production Build
  run: |
    cd client
    npm run build