feat: add PR review metrics — reviews given vs received (#253)

[mallya-m]

Summary

Adds a "Reviews Given" tab to the existing PR Analytics card so users can see their code review contributions alongside their authored PRs.

Closes #253

Type of Change

• Bug fix
• New feature
• Documentation update
• Refactor / code cleanup

Changes Made

• Added fetchReviewMetrics() in route.ts using GitHub GraphQL pullRequestReviewContributions
• Extended GET handler to return review data for single, combined, and per-account modes
• Added tab switcher (PRs Authored / Reviews Given) to PRMetrics.tsx
• New Reviews Given tab shows: total reviews, approval rate, most reviewed repos (top 5)

How to Test

1. Run npm run dev
2. Open http://localhost:3000
3. Go to the PR Analytics card
4. Click the "Reviews Given" tab
5. Verify total reviews, approval rate, and top repos are displayed
6. Click "PRs Authored" tab — verify existing stats still work

Screenshots

Checklist

• Linked issue in summary
• npm run lint passes locally
• No TypeScript errors (npm run type-check)
• Self-reviewed the diff
• Added/updated tests if applicable

[vercel]

@mallya-m is attempting to deploy a commit to the PRIYANSHU DOSHI's projects Team on Vercel.

A member of the Team first needs to authorize it.

[github-actions]

GSSoC Label Checklist 🏷️

@Priyanshu-byte-coder — please apply the appropriate labels before merging:

Difficulty (pick one):

• level:beginner — 20 pts
• level:intermediate — 35 pts
• level:advanced — 55 pts
• level:critical — 80 pts

Quality (optional):

• quality:clean — ×1.2 multiplier
• quality:exceptional — ×1.5 multiplier

Validation (required to score):

• gssoc:approved — counts for points
• gssoc:invalid / gssoc:spam / gssoc:ai-slop — does not score

Type labels (type:*) are auto-detected from files and title. Review and adjust if needed.
Points formula: (difficulty × quality_multiplier) + type_bonus

[mallya-m]

Hi @Priyanshu-byte-coder!

The implementation for #253 is ready for review.

Here's a quick summary of what's been added:

• fetchReviewMetrics() via GitHub GraphQL pullRequestReviewContributions
• Extended the existing /api/metrics/prs route to include review data
• New Reviews Given tab in the PR Analytics card showing total reviews, approval rate, and most reviewed repos (top 5)
• Graceful fallback when no reviews are found

Could you please add the following labels?

• level:intermediate
• gssoc:approved
• quality:clean
• type:feature

Happy to make any changes based on your feedback. Thanks!

[Priyanshu-byte-coder]

Two issues:

1. Wrong file path — src/types/src/types/css.d.ts has a double src/types/src/types in the path. This should be src/types/css.d.ts.

2. Missing EOF newlines on both src/types/src/types/css.d.ts and at least one other file.

[mallya-m]

@Priyanshu-byte-coder fixed both issues:

1. Removed incorrectly nested path — css.d.ts is now correctly at src/types/css.d.ts
2. Added EOF newlines to all modified files

Ready for merge!