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

nuxt.config.ts

@@ -1,5 +1,27 @@
+import { defineNuxtConfig } from "nuxt/config";
 // https://nuxt.com/docs/api/configuration/nuxt-config
 export default defineNuxtConfig({
-  compatibilityDate: '2025-07-15',
-  devtools: { enabled: true }
-})
+  compatibilityDate: "2025-07-15",
+  devtools: { enabled: true },
+
+  // Keep SSR on (default) with Nitro server
+  ssr: true,
+
+  // Strict TypeScript
+  typescript: {
+    strict: true,
+  },
+
+  // Global CSS (Tailwind for @nuxt/ui)
+  css: ["~/assets/css/main.css"],
+
+  modules: [
+    "@pinia/nuxt",
+    "@nuxt/ui",
+    "@nuxtjs/color-mode",
+    "@nuxtjs/tailwindcss",
+  ],
+
+
+  // Nuxt UI minimal theme customizations live in app.config.ts
+});