When system is in dark mode ask the user which mode they want to use
## Summary
<!-- Write the User Story summarizing the feature. For instance As a user I want to be able to sort my preset timers in order to find them more easily -->
**As a** Cardinal user with dark mode set in my device's settings
**I want to** be asked in which mode to display Cardinal's interface when I first launch it while in dark mode
**in order to** have the opportunity to select the light mode if I want to
## Description
<!-- Write the details you have in mind about this feature -->
When the user's first launches Cardinal while their system is in dark mode, display a dialog asking in which mode they want to display Cardinal:
> **/e/OS Maps display**
>
> Use Maps in:
> - [ ] Light theme always
> - [ ] Dark theme always
> - [ ] Same as device theme
>
> [Save]
The choices are radio buttons and by default `Light theme always` is selected.
Make this option available in Cardinal's settings as well.
## Mock-ups
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This is not an exact mock-up but an inspiration:
{width=277 height=600}
## Validation
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issue