Add CI workflow (lint + build) on push/PR to main

[TaylorONeal]

Summary

Adds a GitHub Actions CI workflow so every push and pull request to main is automatically linted and built.

Workflow (.github/workflows/ci.yml)

• Triggers: push and pull_request targeting main.
• Job — Lint & Build on ubuntu-latest:
  • Node 20 with npm cache
  • npm ci
  • npm run lint
  • npm run build
• Concurrency: in-progress runs for the same ref are cancelled when new commits arrive, to save minutes.

Notes

• npm run lint currently exits 0 (0 errors; the remaining warnings are react-refresh HMR hints in vendored shadcn ui/ files, which do not fail the build).
• Verified locally: npm run lint → exit 0, npm run build → passes.

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