Add unit tests for verifyWebhookSignature helper covering timing-safe comparison behaviour

[Chucks1093]

Summary

The verifyWebhookSignature helper uses crypto.timingSafeEqual for constant-time comparison but this property has no unit test coverage. Tests should confirm the helper rejects signatures that differ by a single character and returns false rather than throwing for length-mismatched signatures.

Scope

• Test signature differing in the last character returns false
• Test signature differing in the first character returns false
• Test a signature that is one character shorter than expected returns false without throwing
• Test a signature that is one character longer than expected returns false without throwing

Acceptance Criteria

• Single trailing character difference returns false
• Single leading character difference returns false
• Shorter signature returns false without throwing
• Longer signature returns false without throwing

ETA: 12 hours

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Coordinate on Telegram

[Ajibose]

@Ajibose has applied to work on this issue as part of the Stellar Wave Program's 7th wave.

can i work on this

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[Fabulouz34]

@Fabulouz34 has applied to work on this issue as part of the Stellar Wave Program's 7th wave.

Hi maintainer please I will appreciate it if I'm given this issue to work on. Please assign me I'm ready to get started
Thank you

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