refactor: decouple username parsing from URL path using backend meta …

[Yashaswini-K-P]

Description

Decoupled username parsing from fragile URL path segments (window.location.pathname.split("/")) by implementing a reliable backend meta-tag injection pattern. The backend now injects the current username into a <meta> tag within user.html, and a centralized frontend helper (utils.js) safely retrieves it.

Linked Issue

Fixes #354

Changes Made

• Created utils.js with a centralized getCurrentUsername() helper to read the current-user meta tag.
• Updated profile-controller.js to remove fragile path-splitting logic and use the new helper function.
• Updated server.js to dynamically replace and inject the __USERNAME__ placeholder into user.html on request.
• Added the <meta name="current-user" content="__USERNAME__"> tag to frontend/user.html.

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

(Not applicable - backend/refactoring change)

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