Fix build of org.mixedrealitytoolkit.uxcore (#1127)

* Move FontIconSelectorMigrationUtility

* Update CHANGELOG.md

* Update package.json

Author: keveleigh

org.mixedrealitytoolkit.uxcore/CHANGELOG.md

@@ -2,6 +2,12 @@
 
 The format is based on [Keep a Changelog](https://keepachangelog.com/en/1.1.0/).
 
+## [4.0.0-pre.4] - 2026-06-10
+
+### Fixed
+
+* Fixed build issue caused by `FontIconSelectorMigrationUtility` not being in an Editor-only assembly.
+
 ## [4.0.0-pre.3] - 2026-05-20
 
 ### Added

…cons/FontIconSelectorMigrationUtility.cs …itor/FontIconSelectorMigrationUtility.csorg.mixedrealitytoolkit.uxcore/FontIcons/FontIconSelectorMigrationUtility.cs renamed to org.mixedrealitytoolkit.uxcore/Editor/FontIconSelectorMigrationUtility.cs org.mixedrealitytoolkit.uxcore/FontIcons/FontIconSelectorMigrationUtility.cs renamed to org.mixedrealitytoolkit.uxcore/Editor/FontIconSelectorMigrationUtility.cs

@@ -1,6 +1,6 @@
 {
   "name": "org.mixedrealitytoolkit.uxcore",
-  "version": "4.0.0-development.pre.3",
+  "version": "4.0.0-development.pre.4",
   "description": "Core interaction and visualization scripts for building MR UI components. Intended to be consumed when building UX libraries. For pre-existing library of components, see the UX Components package.",
   "displayName": "MRTK UX Core Scripts",
   "msftFeatureCategory": "MRTK3",