Theme switch only for Sandbox

[50rayn]

Hello team.
Thanks a lot for this awesome tool. I started to use this since July 2022 and I like it a lot. It helps me a lot to organise and analyse each little details of every component.

So, closer to the topic. I'd like to ask your opinion on adding a Theme Switch only for sandbox. I thinks is not ok to theme to the whole app, just to simulate different themes only for sandbox. Why not to add the Switch in the Background Color dropdown? By clicking the corresponding theme, it will not affect the the whole app.

I implemented this only for iframed story component and added test cases, remains for others types of stories. I wanted to ask your opinion before continuing the development.

sandbox_theme_switch.mov