timeMachine.ts: Write unit tests for clock override boundary conditions

[Kingsman-99]

Description

src/timeMachine.ts provides a clock-override utility used in time-sensitive tests, but there are no tests covering boundary cases: advancing time past midnight, advancing by zero milliseconds, and restoring the real clock after an override.

Acceptance Criteria

• Test: advancing the fake clock to exactly midnight rolls the date correctly
• Test: advancing by 0 ms leaves the clock unchanged
• Test: after restore(), Date.now() returns a value within 50 ms of the real wall clock
• Unit tests pass

Context

• Target file: src/timeMachine.ts
• Tests should live in src/__tests__/timeMachine.test.ts

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[misrasamuelisiguzor-oss]

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[grantfox-oss]

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@misrasamuelisiguzor-oss's PR #709 was approved and merged by @Kingsman-99.

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