chore: add @tailwindcss/postcss and PostCSS setup for Tailwind v4

playwright.config.ts

@@ -0,0 +1,15 @@
+import { defineConfig } from '@playwright/test'
+
+export default defineConfig({
+  webServer: {
+    command: 'npm run dev',
+    port: 3000,
+    timeout: 60_000,
+    reuseExistingServer: true
+  },
+  use: {
+    baseURL: 'http://localhost:3000'
+  }
+})
+
+