Implement Real-time Code Editing using WebSockets

# Implement Real-time Code Editing with WebSockets

## Description
Transform the existing code editor into a real-time collaborative coding environment using WebSockets.

## Proposed Features
- Allow multiple users to edit code simultaneously
- Display other users' cursor positions in real-time
- Show a list of currently active users

## Technical Considerations
- WebSocket implementation for real-time data synchronization
- Robust error handling and connection management

## Acceptance Criteria
- [ ] Users can see changes made by others in real-time
- [ ] Conflicts between simultaneous edits are resolved automatically
- [ ] User cursors are visible to all participants
- [ ] A list of active users is displayed and updates in real-time

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