Test this theme with Site Studio features

Problem/Motivation

Site Studio is a tool that gives several CMS capabilities for easier page creation.
However, they have issues with most of the "Dark based Admin themes".

Steps to reproduce

Install Site Studio
Install Darcula Theme
Review all items from Site Studio

Proposed resolution

This task is just to review possible tasks for evolving this theme.
Future tasks will be added to "Remaining tasks" section.

Remaining tasks

1. ✅ Round 1: Review Site Studio Theme
2. Fix #3355740 ✨ [Site Studio] "Darkfy" Base Style & Custom Style Page Active
3. Fix #3355741 ✨ [Site Studio] "Darkfy" Base Unit Screen Active
4. Fix #3355742 ✨ [Site Studio] "Darkfy" Layout Canvas Field Active
5. Round 2: Review Site Studio Theme