Support for Light and Dark Theme Snapshots

[EduardJelenski]

🎉 Proposal

Currently, there is no option to generate snapshots for both light and dark themes. I believe this is a must-have feature.

Additionally, it would be great to have an option to ignore global theme settings (or even environment settings in general, such as Dynamic Type). That way, you’d be able to test a specific theme without it being affected by global settings.