refactor: command context panel

[bearjcc]

Move the command context panel logic into its own file.
Move the location of it in the UI to take up less screen real estate by moving it to be the same width as the viewport.

[xiangechen]

The toolbar has shifted to the right, looking rather awkward. It should either remain in its original position or be removed entirely and replaced with a floating pop-up window, similar to AutoCAD's interface.

[bearjcc]

Do you like this better?
Auto hidden:

AutoCAD like overlay:

[xiangechen]

A style similar to AutoCAD would be better—more user-friendly for beginners. We can also place the selection confirmation controls within the tabs. (Previously, they were integrated with the Command Context Panel, but I've noticed that many new users struggle after making selections because these controls aren't prominent enough, leaving them unsure how to proceed.)

[bearjcc]

I own SOLIDWORKS and have 10 years experience with it, but I don't have access to nor have I used AutoCAD. I can try making it more like your screenshots.
I did think we could combine them, especially due to the repeated cancel button.
SOLIDWORKS uses a pushpin icon for repeat, would that work here as well instead of the checkbox?

For reference SOLIDWORKS does the equivalent of your Command Context Panel in a Property Panel on the left. SOLIDWORKS commands can be very complicated with tons of inputs though. They have the accept and cancel buttons in 2 places: in the property panel itself and in the viewport.