Feature/clickable leaderboard names

[Yashaswini-K-P]

Description

This pull request adds an interactive user profile feature to the CodePVG leaderboard. Users can now click on any student's name on either desktop or mobile views to navigate to a dedicated profile page (/user/:username) showing their individual stats and breakdown.

Linked Issue

Fixes #142

Changes Made

• Backend (server.js): Added dynamic routing for /user/:username and an API endpoint /api/user/:username to fetch user stats.
• Frontend Template (user.html): Created a new profile view template securely integrating server nonces and username parameters.
• Profile Logic (profile.js): Implemented client-side data fetching and dynamic DOM population for user statistics.
• Leaderboard Rendering (render.js): Updated renderLeaderboardRow and renderMobileCard to wrap student names in internal route links pointing to their profiles.
• Styles (main.css): Added clean link inheritance classes (.leaderboard-user-link) to preserve existing text colors and remove default anchor styling/underlines.

Type of Change

• Bug fix
• New feature
• UI/Visual update
• Documentation update
• Refactor

Testing

• Tested locally
• Tested on mobile viewport (if applicable)
• No console errors introduced

Checklist

• My code follows the project's coding style
• I have formatted my code locally by running npx prettier --write . before submitting
• I am submitting my PR from a dedicated feature/* branch, not the main branch
• I have performed a self-review of my code
• My changes generate no new warnings or errors
• I have updated documentation if required
• I have linked the relevant issue

Screenshots / Screen Recording

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