test : add unit test for decryptToken null handling on invalid iv

[tmdeveloper007]

Summary of What Needs to be Done:
Add a unit test that verifies decryptToken returns null when given an invalid IV that does not match the required 24-character hex format.

Changes that Need to be Made:

• Add test case in test/crypto.test.js that calls decryptToken with valid encrypted data but invalid IV (e.g., wrong length or non-hex characters) and asserts null is returned

Impact that it would Provide:

• Improves test coverage for input validation in the crypto module

[saurabhhhcodes]

Hi @Priyanshu-byte-coder, I can take this test coverage issue if it is available. I already have the crypto test context fresh from #468, so I would keep this as a very small focused PR: add the invalid-IV regression case in test/crypto.test.js, run the crypto/dependency tests, type-check/lint if needed, and avoid touching production crypto logic. Please assign it to me if that works.

[github-actions]

✅ Closed as completed!

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