Merged in chore/upgrade-vitest4 (pull request #3253)

chore: upgrade to vitest@4

* chore: upgrade to vitest@4


Approved-by: Anton Gunnarsson

packages/design-system/package.json

@@ -262,7 +262,8 @@
     "@typescript-eslint/eslint-plugin": "^8.32.0",
     "@typescript-eslint/parser": "^8.32.0",
     "@vitejs/plugin-react": "^5.1.1",
-    "@vitest/browser": "^3.2.4",
+    "@vitest/browser": "^4.0.0",
+    "@vitest/browser-playwright": "^4.0.0",
     "babel-plugin-formatjs": "^10.5.10",
     "class-variance-authority": "^0.7.1",
     "colord": "^2.9.3",
@@ -291,7 +292,7 @@
     "vite": "^7.2.4",
     "vite-plugin-dts": "^4.5.4",
     "vite-plugin-lib-inject-css": "^2.2.2",
-    "vitest": "^3.2.4",
+    "vitest": "^4.0.0",
     "vitest-browser-react": "^1.0.1"
   }
 }