Ci workflow and fixes

[Jonniie]

Summary

• Add GitHub Actions CI pipeline for lint, type-check, and build
• Fix all lint errors (17 errors resolved)
• Fix TypeScript type errors
• Fix build errors

🚀 Checklist

• Code follows project style guidelines.
• Changes are tested and verified.
• [x ] Documentation is updated (if needed).

🔗 Related Issues

• Closes Set up GitHub Actions CI pipeline for lint, type-check, and build on every PR #158

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@Jonniie Great news! 🎉 Based on an automated assessment of this PR, the linked Wave issue(s) no longer count against your application limits.

You can now already apply to more issues while waiting for a review of this PR. Keep up the great work! 🚀

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