Test: Add fallback unit tests for formatLocaleDate and formatLocaleTime #78

[SaumyaT-21]

Description

Added fallback unit tests for formatLocaleDate and formatLocaleTime (issue #78) to safely handle "undefined" and "null" user inputs. Ensures that the system won't crash and will cleanly fall back to returning "N/A" if empty values leak through.

Related Issues

Closes issue #78

Type of Change

• [ x ] Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to not work as expected)
• Documentation update

How Has This Been Tested?

Ran the local Vitest testing framework inside the frontend folder.
Verified that the test suite inside testing/unit/utils/date.test.ts successfully expanded from 15 passing tests to 19 passing tests, proving the new fallback paths work under simulation.

Checklist

• [ x ] My code follows the code style of this project.
• [ x ] I have performed a self-review of my own code.
• I have commented my code, particularly in hard-to-understand areas.
• I have made corresponding changes to the documentation.
• [ x ] My changes generate no new warnings.

[utksh1]

Thanks! A couple quick nits before merge:\n\n- Fix typos: -> in test names.\n- Minor formatting: remove extra space in and align arrow spacing for consistency.\n\nAlso, since this is frontend-only, if backend-tests are failing due to unrelated CI flakiness, please rerun CI once the above is fixed.

[utksh1]

Thanks! A couple quick nits before merge:

• Fix typos in test names: “undefinied” -> “undefined”.
• Minor formatting: remove extra space in expect(...) and keep arrow spacing consistent.

Also, since this is frontend-only, if backend-tests are failing due to unrelated CI flakiness, please rerun CI once the above is fixed.