CmdPal Dock: [Window walker] - make this extension be a secondary taskbar

### Description of the new feature / enhancement

this extension should've been a secondary taskbar for managing active windows (implementation should be like virtual desktop extension, but for replicating taskbar task-list)

### Scenario when this would be used?

this extension should've been a secondary taskbar for managing active windows because this is useful when taskbar is broken, like sometimes my explorer is in a crash loop because of an app and this extension can be a secondary taskbar

### Supporting information

_No response_

Start with the CmdPal Dock Window walker extension and compare it with the virtual desktop extension mentioned in the issue. Identify how active windows and the task-list are currently represented, then define the secondary-taskbar behavior and its completion criteria before making changes.

Written by the indexing model from the issue text.