Sprint 6C: web workspace verification stabilization

[samrusani]

Summary

• add a committed non-interactive ESLint setup for apps/web
• intentionally adopt the Next-managed TypeScript config updates so build stops rewriting tracked files
• keep Sprint 6A and 6B behavior intact with only a narrow approval-actions lint cleanup

Verification

• npm run lint in apps/web: PASS
• npm test in apps/web: PASS
• npm run build in apps/web: PASS

Notes

• apps/web/tsconfig.json and apps/web/next-env.d.ts remained stable before and after build
• no backend or product-scope expansion entered the sprint