add build:w script

packages/preset-themes/package.json

@@ -6,7 +6,8 @@
   "type": "module",
   "scripts": {
     "dev": "vite",
-    "build": "tsc && vite build",
+    "build": "vite build",
+    "build:w": "vite build -w",
     "preview": "vite preview"
   },
   "dependencies": {