Add Fork Tree visualization tab — show top forks and active divergent forks

[AditthyaSS]

The project is named Forkling but doesn't have any fork-related analysis. Add a "Forks" tab under the repo detail view that shows:

Top forks sorted by stars and recent activity
Whether forks are ahead/behind the upstream repo
Active fork detector — highlights forks that have diverged significantly (potential successor projects or maintained alternatives)
This could use GitHub's GET /repos/{owner}/{repo}/forks?sort=stargazers endpoint (no extra token scopes needed).

This feature aligns perfectly with the project's name and identity.

[shahkhushi0307]

Hi,
I'd like to work on this issue as part of ECSoC 2026.

I've gone through the issue and would appreciate it if you could assign it to me.

Thank you!

[shahkhushi0307]

This feature was implemented in PR #40 which has been merged. The Forks tab with summary cards, top forks by stars, ahead/behind comparison, active divergent fork detector, stars distribution chart, and search/filter controls is now live.