Chromecast full screen view

[turkeyphant]

What do you want to be added?

Ability to Chromecast the full screen view to other displays (alternatively server backends with the webui)

Additional context

[github-actions[bot]]

This issue has been automatically marked as stale because it has not had recent activity. The resources of the Feishin team are limited, and so we are asking for your help. If this is a bug and you can still reproduce this error on the development branch, please reply with all of the information you have about it in order to keep the issue open. This issue will automatically be closed in the near future if no further activity occurs. Thank you for all your contributions.