add missing dependencies, fix postcss config

Author: gabrielmfern

packages/preview-server/package.json

@@ -31,6 +31,7 @@
     "@radix-ui/react-tooltip": "1.2.8",
     "@react-email/components": "workspace:*",
     "@react-email/tailwind": "workspace:2.0.1",
+    "@tailwindcss/postcss": "4.1.17",
     "@types/babel__core": "7.20.5",
     "@types/babel__traverse": "7.20.7",
     "@types/css-tree": "2.3.10",
@@ -41,7 +42,6 @@
     "@types/react": "19.0.10",
     "@types/react-dom": "19.0.4",
     "@types/webpack": "5.28.5",
-    "autoprefixer": "10.4.21",
     "clsx": "2.1.1",
     "colorjs.io": "0.5.2",
     "esbuild": "0.25.10",

packages/preview-server/postcss.config.js

@@ -1,8 +1,5 @@
-const path = require('node:path');
-
 module.exports = {
   plugins: {
-    tailwindcss: { config: path.resolve(__dirname, 'tailwind.config.ts') },
-    autoprefixer: {},
+    "@tailwindcss/postcss": {},
   },
 };