Real-time Collaborative Whiteboard Feature

[vimalyad]

Real-time Collaborative Whiteboard Feature

Description

This PR implements the real-time collaborative whiteboard feature for Studi.io study rooms.

Key Functionality:

• Users can draw on a shared canvas using a pencil tool within a study room.
• Drawing actions (creating paths) are broadcast instantly to other members in the same room via Socket.IO.
• Includes basic toolbar controls for switching between draw/select modes, changing brush color, and adjusting brush size.
• A "Clear Canvas" button allows users to wipe the board.
• The whiteboard state is periodically saved to the database (StudyRoom.whiteboardState) via a Socket.IO event.
• When a user joins a room, the currently saved whiteboard state is loaded onto their canvas.
• The canvas is responsive and adjusts to window resizing.

Technical Implementation:

• Frontend: Uses fabric.js library for canvas manipulation within a React (Whiteboard.tsx) component. Socket.IO client handles sending/receiving drawing events (drawing, load-whiteboard-state, save-whiteboard-state).
• Backend: Added Socket.IO event handlers (drawing, save-whiteboard-state) in socketHandler.js to relay drawing data and persist the canvas state to MongoDB. Updated join-room handler to emit load-whiteboard-state.

Type of Change

• Bug fix
• New feature
• Breaking change
• Documentation update

Testing

• I have tested these changes locally
• All tests pass
• I have added tests for new features

Checklist

• My code follows the project's style guidelines
• I have commented my code where necessary
• I have updated the documentation
• My changes generate no new warnings

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