Implement Collaborative Whiteboard

# Implement Collaborative Whiteboard

## Description
Add a shared whiteboard feature to the coding environment for diagramming and visual explanations.

## Proposed Features
- Basic drawing tools (pen, shapes, eraser)
- Text insertion capability
- Real-time synchronization of drawings across users
- Ability to save and load whiteboard states

## Technical Considerations
- Canvas-based drawing implementation
- Real-time synchronization of drawing actions
- Efficient data structure for representing and transmitting drawings
- Undo/redo functionality

## Acceptance Criteria
- [ ] Users can draw on the whiteboard and see others' drawings in real-time
- [ ] Basic shapes and free-form drawing are supported
- [ ] Text can be added to the whiteboard
- [ ] Whiteboard state can be saved and loaded

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