Add v1.0.0 to changelog

Author: acelaya

CHANGELOG.md

@@ -4,7 +4,7 @@ All notable changes to this project will be documented in this file.
 
 The format is based on [Keep a Changelog](https://keepachangelog.com/en/1.0.0/), and this project adheres to [Semantic Versioning](https://semver.org).
 
-## [Unreleased]
+## [1.0.0] - 2025-06-17
 ### Added
 * Add `brandColor()` and `brandColorAlpha()` functions, which resolve the right brand color depending on the active theme.