Fix/issue 2360 remove localstorage tokens

[Prateek2007-cmd]

Description

Resolves Issue #2360 (JWT Storage Vulnerable to XSS).

Following the migration to secure, split-token HttpOnly cookies, the frontend authentication controllers (register.js and login.js) continued to execute legacy persistence logic (localStorage.setItem). Because localStorage is completely unprotected from JavaScript evaluation, this logic inadvertently preserved the XSS attack vector.

This PR purges the legacy logic, finalizing the security migration.

Changes Made

• XSS Mitigation: Removed all localStorage.setItem('token', ...) operations from the authentication endpoints.
• Client Sanitization: The frontend is now fully unaware of the cryptographic session payload, completely sandboxing it from DOM-level attacks.

Type of Change

• Security Fix
• Technical Debt

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