fix: correct feedback sentiment and tech partner metrics

[nehayadav827]

Description

This PR fixes two data correctness issues in src/lib/data-processing.ts related to BuilderOS analytics and contribution metrics.

What problem does it solve?

1. feedbackSentiment previously hardcoded neutral and negative feedback counts to 0, preventing the dashboard from surfacing actual sentiment distribution.

2. calculateTechPartnerMetrics() grouped directly by Which Tech Partner, causing values like "Libp2p, Storacha" to be treated as a single combined partner instead of separate normalized partners.

Relates to #68

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Changes

• Fix
• Added calculateNeutralFeedback() and calculateNegativeFeedback()
• Updated feedbackSentiment to use real calculated values
• Refactored calculateTechPartnerMetrics() to use normalizeTechPartners()
• Improved multi-partner metric aggregation logic
  -[x] Kept changes scoped to src/lib/data-processing.ts

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Screenshots / Demo

Updated feedback sentiment flow

Updated tech partner normalization logic

Diff statistics and formatting validation

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Additional Notes

Validation performed:

• git --no-pager diff --check passes successfully.
• npm run lint currently opens the interactive Next.js ESLint setup prompt.
• Existing unrelated test/type issues are present in src/lib/__tests__/utils.test.ts.

No breaking changes introduced.

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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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