[Feature] Add a class to determine if a transparency option is enabled

A clear and concise description of the feature you'd like to see

If I set --background-base-lowest to #50505000 It uses the correct colours in and out of focus with transparency option on but when set to none shows as full black rather than #505050

There would need to be a class that I can look for to apply the transparent background and fallback to the color only one if it's not present (This would also make it work with Better Discord clients).

Implementation Notes

No response

Additional context

No response

Request Agreement

• I've searched existing issues and this hasn't been suggested before
• This is a core modification feature, not a plugin request (those go in Discord)
• This feature would benefit most users, not just a specific use case
• I understand that if any of the above conditions are not met, this issue will be deleted and I will be banned from creating future issues without further warning
• I am willing to work on this myself