feat: Improve WebMCP connection handling and tools management
WebMCP service:
- Add headless mode configuration
- Implement proper event handlers with unsubscribe support
- Add connection info tracking (channel, server, status, tools)
- Add destroyWebMCP for cleanup
- Improve connectWithToken to pass token directly
Canvas store:
- Add connection state (reconnecting, status, error, info)
- Add computed statusColor for UI feedback
Components:
- Add ConnectionDropdown for connection status display
- Add ToolsDropdown for tools management UI
Tool registry:
- Improve tool activation/deactivation logic
- Better error handling and logging