Task: Design a "Multi-Camera Workspace" component for Apollo Dreamview that operates as a separate full-screen overlay.

1. Window Management (React):

• Requirement: Use react-grid-layout to create a draggable and resizable grid container.
• Component: Create a CameraCard component that encapsulates the video stream, topic name, and a "Close" button.
• State: Use a local LayoutConfig to save the positions of windows during the session.

2. Data Stream Multiplexing:

• Logic: When this workspace is active, initialize a MultiTopicSubscriber.
• Action: It should send a batch "Subscribe" message to the Dreamview backend for all selected camera topics.
• Format: Render each stream using canvas or img tags optimized for base64/binary JPEG strings.

3. Transition Logic:

• Requirement: Provide a toggleWorkspace function.
• Behavior: * onEnter: Save current Dreamview state -> Disable 3D cloud rendering -> Open Workspace.
• onExit: Unsubscribe from extra cameras -> Enable 3D cloud rendering -> Close Workspace.