feat: implement portal shell layout with user authentication, sidebar navigation, and progress tracking

package.json

@@ -13,6 +13,9 @@
     "@ai-sdk/openai": "^3.0.68",
     "@ai-sdk/react": "^3.0.199",
     "@base-ui/react": "^1.5.0",
+    "@dnd-kit/core": "^6.3.1",
+    "@dnd-kit/sortable": "^10.0.0",
+    "@dnd-kit/utilities": "^3.2.2",
     "@ducanh2912/next-pwa": "^10.2.9",
     "@hookform/resolvers": "^5.4.0",
     "@iconify/react": "^6.0.2",