[TASK] Make treelist context aware

The new panel treelist styling is context aware
and adapts to light and dark color schemes. This
patch also restores the visibility of treelines
in Pagetree overview and Localization overview.

Resolves: #104845
Releases: main
Change-Id: I82785daec2de46e259eca757206e502798922069
Reviewed-on: https://review.typo3.org/c/Packages/TYPO3.CMS/+/85914


Reviewed-by: Oliver Bartsch <bo@cedev.de>
Tested-by: core-ci <typo3@b13.com>
Reviewed-by: Benjamin Franzke <ben@bnf.dev>
Tested-by: Andreas Kienast <a.fernandez@scripting-base.de>
Tested-by: Benjamin Franzke <ben@bnf.dev>
Reviewed-by: Andreas Kienast <a.fernandez@scripting-base.de>
Tested-by: Oliver Bartsch <bo@cedev.de>