Dock: Add support for a band in the taskbar too

### Description of the new feature / enhancement

Give the option to embed the command pallet dock into the taskbar to more efficiently use space.

### Scenario when this would be used?

For people who don't pin many programs to the taskbar and therefore have free taskbar space, and those who don't want to sacrifice more screen space.

### Supporting information

_No response_

Start by locating the command palette dock and reviewing how taskbar space is currently handled; the issue names no files or tests. Done means offering an optional way to embed the command palette as a taskbar band while supporting users who want to save screen space.

Written by the indexing model from the issue text.