Add CI workflow

[JustTryAI]

Summary

• add GitHub Actions workflow to run tests and builds on push and pull_request

Testing

• CI=true npm test
• npm run build (fails: Could not resolve entry module "index.html".)

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https://chatgpt.com/codex/tasks/task_e_68b459c9fb088328aec9ccd0c43c47d8

[chatgpt-codex-connector]

Codex Review: Here are some suggestions.

Reply with @codex fix comments to fix any unresolved comments.

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[chatgpt-codex-connector]

[P1] Avoid adding a failing build step to CI

The workflow runs npm run build, but this project currently has no root index.html and vite build aborts with Could not resolve entry module "index.html". (reproducible locally with npm run build). As written, the new CI job will fail on every push or pull request until the build is fixed, effectively blocking CI. Consider omitting the build step or adjusting Vite so it can find the entry file before enabling this check.

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