Refactor dashboard.Container to manage detached item lifecycle

Objective Move the logic for managing detached items (drag-to-window and re-integration) from application-level Viewport Controllers (e.g., AgentOS.view.ViewportController, Colors.view.ViewportController) into the core Neo.dashboard.Container. This will standardize the behavior and significantly improve Developer Experience (DX).

Key Changes

1. New Configs on Neo.dashboard.Container:

   • detachToNewWindow (Boolean, default true): Enables the drag-to-window feature.
   • popupConfig (Object): Default window features (e.g., {height: 600, width: 800}).
   • popupUrl (String|Function): A default template for the popup URL.
   • detachedItems (Map): Internal state to track items currently in popups.

2. Per-Item Configuration:

   • Dashboard items (panels) can override the default popupUrl via a custom config (e.g., popupUrl property on the item itself). This is critical for applications like AgentOS where different widgets require different app shells (e.g., swarm uses a canvas-enabled shell).

3. Lifecycle Management:

   • Implement onDragBoundaryExit in dashboard.Container to handle opening the popup.
   • Implement onDragBoundaryEntry in dashboard.Container to handle closing the popup and re-integrating the item.
   • Handle Neo.currentWorker connect/disconnect events within the container to manage state when windows are closed manually.

4. Cleanup:

   • Remove the redundant logic from AgentOS and Colors Viewport Controllers.