feat: home screen widget colors

[bl4ckswordsman]

Prerequisites

• [x] I have read the Contributing Guidelines.
• [x] I agree to follow the Code of Conduct.
• [x] I have searched for existing issues that already include this feature request, without success.

Describe the Feature Request

It would be cool if I could select different colors than the default blue/turquoise for different countdown widgets in the home screen.

Describe the Use Case

Differentiate different countdowns in the home screen in an easier way

Describe Preferred Solution

When adding a widget, allow the user to select color. Or allow the user to select color when editing the countdown.

Describe Alternatives

No response

Related Code

No response

Additional Information

No response