feat: Optimize build and dependencies

Introduce manual chunking for vendor dependencies to improve load times.
Update Node.js engine requirement to >=18.0.0.
Refactor `AccountsReceivableView` by removing commented-out code and unnecessary variables.
Add a development server port configuration.

package.json

@@ -11,13 +11,16 @@
     "preview": "vite preview",
     "start": "node server.js"
   },
+  "engines": {
+    "node": ">=18.0.0"
+  },
   "dependencies": {
     "@google/genai": "^1.39.0",
+    "express": "^4.21.1",
     "lucide-react": "^0.454.0",
     "react": "^19.0.0",
     "react-dom": "^19.0.0",
-    "recharts": "^2.13.0",
-    "express": "^4.21.1"
+    "recharts": "^2.13.0"
   },
   "devDependencies": {
     "@types/react": "^19.0.0",