Steps to reproduce the issue

use Joomla! 5.0 beta or from the github

Expected result

I have darkmode when add data-bs-theme="dark" at < html > tag (I edit index.php now for test, I make JavaScript for autochanged darkmode later)

Actual result

I have not darkmode

System information (as much as possible)

macos ventura
Google Chrome last update
php 8.2
unsure mysql

Additional comments

Atum, problem is build/media_source/templates/administrator/atum/scss/_variables.scss:

// Disable dark mode in J4.4 - it's going to cause major b/c breaks to introduce. We will enable it in 5.0
$enable-dark-mode:                 false;

Cassiopeia, problem is same build/media_source/templates/site/cassiopeia/scss/tools/variables/_variables.scss :

// Disable dark mode in J4.4 - it's going to cause major b/c breaks to introduce. We will enable it in 5.0
$enable-dark-mode: false;

This joomla 5. Has to be enable, no? Sorry if i make mistake.