Add agent monitor with state tracking and history

[liangzhang-keepmoving]

Description

This PR adds an AgentMonitor component that provides real-time monitoring of agent states and a history of agent activities.

Features Added

• Real-time Agent Monitoring: Displays the current state (running/idle) of each agent
• Node Tracking: Shows the current node name for running agents
• Activity History: Records and displays a timeline of agent activities (start/stop/node changes)
• Timestamped Events: Each activity includes a timestamp for reference
• Visual Status Indicators: Uses icons and colors to indicate agent status

Changes Made

• Created AgentMonitor component with state management
• Added agent state monitoring using useCoAgent hook
• Implemented activity history recording and display
• Added the component to the canvas layout below the chat window

Testing

The agent monitor has been tested with:

• Multiple agents running simultaneously
• Agent state changes (starting/stopping)
• Node changes for running agents
• Activity history recording and display

All features work as expected, providing clear visibility into agent activities.

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