chore: update dependencies for Next.js and Tailwind CSS

- upgraded Next.js from 14.0.4 to 16.4.3
- upgraded Tailwind CSS from 2.1.2 to 4.3.3

package.json

@@ -8,7 +8,7 @@
     "start": "next start"
   },
   "dependencies": {
-    "next": "^14.0.4",
+    "next": "^16.4.3",
     "react": "^18.2.0",
     "react-dom": "^18.2.0",
     "sass": "^1.32.12"
@@ -16,6 +16,6 @@
   "devDependencies": {
     "autoprefixer": "^10.2.5",
     "postcss": "^8.2.13",
-    "tailwindcss": "^2.1.2"
+    "tailwindcss": "^4.3.3"
   }
 }