feat: UI / layout updates (#271)

* feat: Enhance UI/layout, update Atlas content and design system, and resolve various display issues

* Layout & UI Improvements
  * Fixes for topbar (centering, active navigation, default closed width, padding).
   * Introduce options for topbar bottom border and sidebar border.
   *  Add design properties for background toggle and color.
* Bug Fixes
  * Resolve duplicate menu issues.
  * Fix scroll container regions z-index issues to prevent element competition.
* Maintenance:
 * Changelog updates and typo fixes.

* update combobox styling

* update package json

* update exclusion vars and branch

* use grid topbar wrapper on topbar layout

* add changelog

* update screenshots and test

* update test project path and changelog

---------

Co-authored-by: gjulivan <grandjulivan@gmail.com>

Author: takumagott

packages/atlas-core/CHANGELOG.md

@@ -1,7 +1,7 @@
 {
   "name": "atlas-core",
   "moduleName": "Atlas Core",
-  "version": "4.2.0",
+  "version": "4.3.0",
   "license": "Apache-2.0",
   "copyright": "© Mendix Technology BV 2024. All rights reserved.",
   "repository": {

packages/atlas-core/package.json

@@ -14,7 +14,7 @@
   },
   "testProject": {
     "githubUrl": "https://github.com/mendix/Atlas-Design-System",
-    "branchName": "atlas4-layout-fixes",
+    "branchName": "main",
     "mxVersion": "11.0.0.73100"
   },
   "scripts": {