refactor: transition profile scripts to ES6 modules with global controller

[Yashaswini-K-P]

Description

Transitioned profile page frontend scripts (badges.js, contest.js, goal-setter.js, historical-graphs.js, and ranks.js) to modern ES6 modules orchestrated by a single profile-controller.js entry point. This eliminates redundant concurrent network requests to GET /api/user/:username on page load, cuts network overhead by 75%, and ensures smooth, synchronized UI rendering across all dashboard components.

Linked Issue

Fixes #292

Changes Made

• Created a central profile-controller.js module to fetch user profile data exactly once on page load.
• Refactored individual component scripts into ES6 modules accepting data payloads directly as arguments rather than triggering independent fetch calls.
• Updated user.html to load the profile via a single <script type="module" src="/js/user/profile-controller.js"></script> tag.
• Preserved strict username path resolution matching legacy structure.

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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