fix: return normalized lowercase name when contributor not found in alias map

[Harshit-Mishra2212]

Problem

normalizeContributorName() in src/lib/constants.ts lowercases the input into a variable called normalized to look up the alias map, but falls back to the original name (with its original casing) when no alias is found.

This means the same contributor can produce different return values depending on how their name was capitalized in Airtable:

• normalizeContributorName('Prabhat') → 'Prabhat'
• normalizeContributorName('prabhat') → 'prabhat'

These two values are not equal, so the same real person gets treated as two different contributors. More critically, the returned value is used in validateContributions() to match against GitHub issue assignee logins, which are always lowercase. A mixed-case return value will never match a GitHub login, causing real contributions to be marked as discrepancies.

Fixes #54

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Changes

• Fix
• Changed || name to || normalized in normalizeContributorName() so it always returns the lowercased version when no alias is found

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📷 Screenshots / Demo (if applicable)

N/A — logic fix. Behaviour before and after:

// Before
normalizeContributorName('Prabhat') → 'Prabhat'
normalizeContributorName('prabhat') → 'prabhat'
// same person, different values — breaks GitHub login matching

// After
normalizeContributorName('Prabhat') → 'prabhat'
normalizeContributorName('prabhat') → 'prabhat'
// consistent, alias lookups still work as before

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Additional Notes

One word changed in src/lib/constants.ts, no other files touched. Alias lookups are completely unaffected since they return directly from the map before hitting the fallback.

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Checklist

• I have tested this code
• [-] I have added necessary documentation
• I have linked relevant issue(s)
• I followed the code style of the project
• I reviewed my own code

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