feat: integrate dynamic unit test runner and automate CI workflow

[DebasmitaBose0]

Closes #5322

Summary

Introduces an automated GitHub Actions CI pipeline and couples unit tests with a dynamic runner, assuring 100% branch integrity for future updates.

Changes Made

• Streamlined test:unit in package.json to call node scripts/run-unit-tests.mjs.
• Configured .github/workflows/ci.yml to trigger on main push events and pull requests.
• Implemented robust Node dependency caching inside the runner setup steps.

Testing

• Tested locally by executing npm run test:unit, which dynamically located and executed all .test.mjs test suites.
• Validated workflow syntax against standard GitHub Actions specification rules.

Impact

Assures continuous quality enforcement on all commits and pull requests, preventing regressions and streamlining reviews.

Checklist

• Code follows project standards
• Tested locally
• No unrelated changes included
• Responsive design verified
• Accessibility considered

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