UI: Remove unused direction factor CSS property (#80269)

* UI: Remove unused direction factor CSS property

* Update CHANGELOG.md

Co-authored-by: aduth <aduth@git.wordpress.org>
Co-authored-by: ciampo <mciampini@git.wordpress.org>

Author: aduth

packages/ui/CHANGELOG.md

@@ -2,6 +2,10 @@
 
 ## Unreleased
 
+### Code Quality
+
+-   Remove unused CSS property from `Tabs` stylesheet ([#80269](https://github.com/WordPress/gutenberg/pull/80269)).
+
 ## 0.18.0 (2026-07-14)
 
 ### Breaking Changes

packages/ui/src/tabs/style.module.css

@@ -8,12 +8,10 @@
 			overflow-inline: auto;
 			overscroll-behavior-inline: none;
 
-			--direction-factor: 1;
 			--direction-start: left;
 			--direction-end: right;
 
 			&:dir(rtl) {
-				--direction-factor: -1;
 				--direction-start: right;
 				--direction-end: left;
 			}