feat: add year in code wrapped page

[palakjaiswal16]

Summary

Adds a new /wrapped Year in Code annual recap experience with animated stat slides, annual GitHub activity aggregation, social sharing, and a generated shareable OG image card.

Closes #1073

Type of Change

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

Changes Made

• Added authenticated /wrapped page for the Year in Code recap.
• Added animated slide-based recap UI with year picker and social share buttons.
• Added /api/wrapped endpoint to aggregate annual stats including commits, longest streak, top languages, merged PRs, most contributed repo, most productive month, and peak coding hour.
• Added /api/wrapped/og ImageResponse endpoint for shareable recap cards.
• Added dashboard link to access the Wrapped page.
• Added tests for wrapped stat helper calculations.

How to Test

Steps for the reviewer to verify this works:

1. Run npm run type-check.
2. Run npm run lint.
3. Run npm test -- --run test/wrapped.test.ts.
4. Start the app with npm run dev.
5. Sign in and open /wrapped.
6. Verify the year picker loads annual stats.
7. Navigate through the recap slides.
8. Verify the Twitter/X and LinkedIn share buttons are present.
9. Open /api/wrapped/og?username=test&year=2025&commits=42&streak=7&language=TypeScript&repo=test%2Frepo and confirm a PNG share card is generated.

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

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[github-actions]

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