fix: add vitest/browser package

Author: Hristo313

packages/cli/templates/webcomponents/igc-ts/projects/_base_with_home/files/package.json

@@ -51,6 +51,7 @@
     "vite": "^7.1.16",
     "vite-plugin-pwa": "^1.0.3",
     "vite-plugin-static-copy": "^3.1.3",
-    "vitest": "^3.2.4"
+    "vitest": "^3.2.4",
+    "@vitest/browser": "^3.2.4"
   }
 }