fix(backend): stop logging intentional HttpErrors as unhandled errors

[Anexus5919]

Summary

The global error handler had an unconditional console.error("Unhandled error:", err) before it classified the error, so every intentional HttpError was logged twice, and expected 4xx client errors were recorded as unhandled server errors. This removes the stray line and logs 4xx at warn, 5xx at error.

Changes

• errorHandler.js: remove the unconditional log; log HttpError at warn (status < 500) or error (>= 500).
• Add tests/errorHandler.test.js.

Verification

• New test: a 401 HttpError is not logged as "Unhandled error" and is logged at warn; an unknown error is logged exactly once as unhandled; a 5xx HttpError logs at error. The test fails on the old code and passes on the fix.
• Full backend suite passes.

Related

Fixes #1661

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📥 Commits

Reviewing files that changed from the base of the PR and between 0de0e8a and fca9942.

📒 Files selected for processing (2)

• backend/middlewares/errorHandler.js
• backend/tests/errorHandler.test.js

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests

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[Anexus5919]

@durdana3105 Kindly have a review on this pr. Thanks!