Refactor core utilities for security, performance, and modern browser compatibility in utils.js

[Pankajyadav919]

##Summary
This PR refactors the core utility layer to remove legacy and unsafe patterns and align the codebase with modern JavaScript, browser APIs, and security best practices.
The changes eliminate eval() usage, fix minification-related breakage, remove UI-blocking synchronous network calls, and replace deprecated browser APIs with modern equivalents. Overall, this significantly improves security, performance, maintainability, and CSP compatibility.

✅Safe Object Resolution (Minifier-Proof)
Replaced dynamic resolution via eval() and constructor.name
Introduced an explicit object registry (string → constructor)
Guarantees deterministic behavior under minification (uglify/terser)

✅Removed eval() Usage
Eliminates arbitrary code execution risks
Makes the codebase CSP-compliant
Improves auditability and static analysis

✅sync Networking (No UI Blocking)
Replaced synchronous XMLHttpRequest with async fetch()
Prevents UI freezes and main-thread blocking
Enables parallel resource loading

✅ Removed Hardcoded API Keys
No secrets embedded in client-side code
Prepares codebase for secure backend proxy or env-based injection

✅ Modern Camera API
Replaced deprecated navigator.getUserMedia
Uses navigator.mediaDevices.getUserMedia with proper error handling

✅ Simplified Translation Helper
Removed dead/unused string cleanup logic
Translation helper is now a thin wrapper around i18next.t

✅ Improved Animation Timing
Uses requestAnimationFrame instead of fixed setInterval
Better performance and reduced CPU usage

[github-actions]

✅ All Jest tests passed! This PR is ready to merge.