Dark color palette choice for themes

[ripla]

When styling a template,
I want to choose the component theme my project uses
so that my designs look correct for my project

Scenarios

Change component theme color palette

Given a new project
And a open design with a root "vaadin-button"
And the component theme for the project is "Lumo"
And the component theme color palette for the project is "Light"
When the user changes the component theme color palette to "Dark"
Then "Dark" is used as the component color palette for "vaadin-button"