feat: implement Profile Comparison Analytics (Phase 8)

[saidai-bhuvanesh]

Overview

This PR implements Phase 8: Profile Comparison Analytics to provide a rich visual and statistical comparison between two developer profiles.

Key Changes

• ProfileComparisonAnalytics Component: Displays monthly double bar charts, language side-by-side comparisons, head-to-head repository ranking, and unlocked achievements unlock status board.
• DashboardClient Integration: Positioned comparison analytics underneath the profiles side-by-side card grid.
• Tests: Created ProfileComparisonAnalytics.test.tsx to verify ranking, stats calculation, empty fallbacks, and accessibility.

Fixes #6215

[vercel]

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[github-actions]

🚨 Hey @saidai-bhuvanesh, the CI Pipeline is failing on this PR and it has been marked as status:blocked.

Please fix the issues before this can be reviewed. Here's how:

1. Run checks locally before pushing:

npm run format:check   # Check Prettier formatting
npm run lint           # Run ESLint
npm run typecheck      # TypeScript type check
npm run test           # Run unit tests (Vitest)
npm run build          # Verify production build passes

2. Auto-fix common issues:

npm run format         # Auto-fix formatting with Prettier
npm run lint -- --fix  # Auto-fix lint errors where possible

3. Check the full failure log here:
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Once you push a fix and the CI passes, the status:blocked label will be removed automatically. 💪