chore(release): bump version to 3.0.4 and update changelog

Author: Beowolve

CHANGELOG.md

@@ -4,6 +4,16 @@ All notable changes to this project will be documented in this file.
 
 The format is based on Keep a Changelog, and this project follows Semantic Versioning.
 
+## [3.0.4] - 2026-03-10
+
+### Fixed
+
+- Removed border radius from output and target previews to keep full target visibility.
+- Added a minimum mobile editor height to prevent the code editor from collapsing to a single line.
+- Improved touch interaction for slide/compare mode so the divider can be dragged smoothly on touch devices.
+- Kept tool links in the mobile header between brand and theme switch with compact icon-only layout.
+- Corrected Discord release webhook variable handling in CI.
+
 ## [3.0.3] - 2026-03-10
 
 ### Fixed

package-lock.json

@@ -1,7 +1,7 @@
 {
   "name": "cssbattle-previewer",
   "private": true,
-  "version": "3.0.3",
+  "version": "3.0.4",
   "description": "Modern CSSBattle previewer",
   "type": "module",
   "engines": {