Add integration test for ledger to timestamp helper returning correct estimated date

[Chucks1093]

Summary

The ledgerToTimestamp helper converts a ledger sequence number to an estimated UTC date. An integration test using known reference values should confirm the conversion is accurate before the helper is used in production UI.

Scope

• Call the helper with a reference ledger and timestamp equal to each other — assert the result equals the reference timestamp
• Call with a ledger 100 ahead of reference — assert result is approximately 500 seconds later
• Call with a ledger 100 behind reference — assert result is approximately 500 seconds earlier

Acceptance Criteria

• Equal ledger returns reference timestamp exactly
• Future ledger returns correctly estimated future date
• Past ledger returns correctly estimated past date

ETA: 12 hours

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Coordinate on Telegram

[Michealshodipo56]

@Michealshodipo56 has applied to work on this issue as part of the Stellar Wave Program's 6th wave.

I would like to work on this, kindly assign me

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[Kaycee276]

@Kaycee276 has applied to work on this issue as part of the Stellar Wave Program's 6th wave.

Hi maintainer, can i work on this issue?

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[KingDavid9999]

@KingDavid9999 has applied to work on this issue as part of the Stellar Wave Program's 6th wave.

Hi, I'd like to take this one! My plan is to locate the ledgerToTimestamp helper, confirm its signature, then add a Vitest file covering the three cases in the spec, equal ledger returns the reference timestamp exactly, +100 ledgers returns a date ~500s later, and -100 ledgers returns a date ~500s earlier. Should be a clean, self-contained addition with no mocks needed. I'll have a PR up shortly.

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[grantfox-oss]

🎉 This issue has been marked as completed on GrantFox as part of the Official Campaign campaign!

@Kaycee276's PR #467 was approved and merged by @Chucks1093.

🏆 @Kaycee276: You earned 35 FoxPoints for this contribution! Your current tier: Explorer (576 total points). Track your full progress on GrantFox.

👏 Great work, @Kaycee276! Keep contributing to accesslayerorg.

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