Set different color schemes for light mode and dark mode via UI settings

# Description of the new feature/enhancement

For myself I prefer to use a light scheme for the light mode and a dark scheme for the dark mode. But we can't let Windows Terminal automatically changes the scheme like VSCode.

I'm weak at C++ programming but I'll try my best to understand how it works.

Start by locating Windows Terminal's existing color-scheme settings and the UI entry points for light and dark mode preferences. Trace how the selected scheme is applied when the mode changes. Done means users can select separate light and dark schemes through the UI and Windows Terminal applies the matching scheme automatically.

Written by the indexing model from the issue text.