feat : added a top laung feature for top repos

[Muragesh-24]

Summary

Adds per repo programming language badges to TopRepos, showing the top languages for each repository with colored dots and percentages.
Closes #170

Type of Change

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

Changes Made

• Enriched the repos metrics API with per repo language data from GitHub’s /repos/{owner}/{repo}/languages endpoint.
• Rendered a compact language badge row in TopRepos with GitHub-style color dots.
• Kept the layout stable by reserving space for the language row even when data is missing.
• Added graceful fallback behavior when language fetches fail or return no data.

How to Test

1. Open the dashboard and navigate to Top Repositories.
2. Hover or inspect a repo entry and confirm the language badges appear with percentages and colored dots.
3. Switch the time range and confirm the repo list and language rows still render correctly.
4. Verify repos without language data do not show a broken row.

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]

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[github-actions]

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