build: drop next export; upgrade Tailwind 4; sync lock

Author: GrantHaw

package.json

@@ -2,13 +2,11 @@
   "name": "my-portfolio",
   "version": "0.1.0",
   "private": true,
-
   "scripts": {
     "dev":   "next dev",
-    "build": "next build && next export",
+    "build": "next build",
     "start": "npx serve -s out -l 8080"
   },
-
   "dependencies": {
     "@heroicons/react": "^2.2.0",
     "next": "15.3.4",
@@ -17,7 +15,6 @@
     "react-dom": "^19.0.0",
     "serve": "14.2.4"
   },
-
   "devDependencies": {
     "tailwindcss": "4.1.4",
     "@tailwindcss/postcss": "4.1.4",

postcss.config.mjs

@@ -1,5 +1,5 @@
 export default {
   plugins: {
-    "@tailwindcss/postcss": {},   // Tailwind v4 bridge
+    "@tailwindcss/postcss": {}
   }
 };