feat: add filter by college to friends network and leaderboard (#380)

[MsParadox]

Pull Request 🚀

Description

This PR addresses Issue #380 by implementing the "Filter by College" functionality on the Friends Network & Leaderboard page (src/pages/Friends.jsx).

While the global GitRank page already has a server-side college filter, users previously had no way to filter their direct network (followers, following, and personal leaderboard) by university peers.

Changes Made:

• Imported the existing src/data/colleges.json dataset.
• Created a selectedCollege state inside Friends.jsx.
• Implemented a <select> dropdown UI styled to match the existing Tailwind components.
• Added a useMemo filter block (filteredDevelopers) to instantly sort the active tabs locally.
• Injected the current user's college into the leaderboardStandings local mapping so the user isn't filtered out of their own leaderboard.

Related Issue

Closes #380

Type of Change

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to not work as expected)
• Documentation update

Testing Done

• Verified that switching between Friends, Followers, Following, and Leaderboard correctly respects the active filter.
• Verified "All Colleges" returns the list to its default state.
• Verified mobile responsiveness of the dropdown controls.
• Command run: node fix_lint.mjs
• Visual verification on local dev server (http://localhost:5173)

Checklist

• My code follows the style guidelines of this project.
• I have performed a self-review of my own code.
• I have commented my code, particularly in hard-to-understand areas.
• My changes generate no new warnings or console errors.
• Any dependent changes have been merged and published in downstream modules.

Contributor Declaration

• I confirm that this contribution is made under the rules of GSSoC 2026 and NSoC 2026.
• I confirm that I have been assigned the related issue by a maintainer before opening this PR.
• I have read the Contributing Guidelines and Code of Conduct.

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Project	Deployment	Actions	Updated (UTC)
ranker-hub	Ready	Preview, Comment	Jun 11, 2026 9:12pm