Fix : Improve Login and Register UI/UX, add Toast Notifications, and fix layout bugs

[siddhipatel0707-cpu]

PR Description

Summary of Changes

• Improved UI/UX :Completely changed the Login and Register pages to remove previous visual clutter resulting in a cleaner more modern user experience.
• Streamlined Flow :Removed the redundant User/Administrator role selection to simplify the sign-in and registration process.
• Enhanced Security: Added a dynamic Captcha security check to the login page to prevent automated brute-force attempts.
• Modern Notifications: Replaced browser alerts with toast notifications for success states and inline red-text validation for form errors.
• Dark Mode Integration: Properly enabled and mapped dark mode CSS variables to ensure a flawless, 1:1 visual match across both authentication pages.

Related Issue

Fixes #2262

Type of Change

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Refactor (UI/UX improvements and decluttering)
• Breaking change (fix or feature that would cause existing functionality to not work as expected)
• Documentation update

Verification & Testing

Local Verification

• Built successfully locally
• Console has zero errors or warnings

Devices/Browsers Tested

• Chrome (Desktop)
• Safari (Mobile)
• Firefox

Checklist

• Code follows project styling guidelines
• Changes are fully responsive and accessible
• No extraneous logs or debug code left
• Documentation updated accordingly

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