Record keyword in referral

[Aryan20]

Description

Currently keyword are not carried to the referral, even though we have a field for that. This PR fixes that so that keywords are linked to the respective sale based on the cookie.

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Checklist

• I have carefully reviewed the code before submitting it for review.
• This code is adequately covered by unit tests to validate its functionality.
• I have conducted thorough testing to ensure it functions as intended.
• A member of the QA team has reviewed and tested this PR (To be checked by QA or code reviewer)

[Copilot]

Pull request overview

This PR adds functionality to record keywords in affiliate referrals by linking them to click logs via cookie data. Previously, keywords were tracked in click logs but not carried through to the referral records.

Key changes:

• Modified record_referral() to fetch and set keywords from cookie-based click logs
• Added get_keyword_for_referral() helper function to extract keywords from the affiliate cookie

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