The settings for the default admin theme in forced color mode are either broken or unnecessary [#3636990]

The problems listed in this issue were part of https://git.drupalcode.org/project/gin/-/work_items/3506350 over in the Gin queue

Within the Settings fieldset on admin/appearance/settings/default_admin there are several problems in forced color mode:

the settings field set in the theme settings for the default admin theme in none forced color mode

the caret on the expanded details element is invisible #3636986: The caret on details elements is invisible on hover and expansion in forced color mode
the active option on the appearance switch is not visible - but that setting i would consider unnecessary for forced color mode anyway since the forced color theme of the browser is defining the colors not the drupal theme system
no accent color is visible, the user does not know which color they pick - same like before, that setting i would consider unnecessary for forced color mode anyway since the forced color theme of the browser is defining the colors not the drupal theme system
The focus color is also unnecessary since the forced color theme of the browser is defining the colors not the drupal theme system
the caret of the select element is shifted and shrunk #3636987: The position of the caret on select elements is shifted in forced color mode
the increase contrast toggle switch is sort of unnecessary in forced color mode. forced color mode is about clarity and high contrast anyway.
the icon within the layout density checkboxes are missing all three options look identical.

Enable forced color mode in for example the microsoft edge devtools. on the rendering tab chose prefers-color-scheme: dark, forced-colors: active, and prefers-contrast:more
Go to admin/appearance/settings/default_admin