refactor: Streamline project configuration and styling

This commit simplifies the Vite configuration by removing unnecessary options like `base`, `sourcemap`, and custom `rollupOptions`. It also removes the explicit server port definition, allowing Vite to manage it.

Additionally, minor styling adjustments are made to the scrollbar in `index.html` and default values for select inputs in `AccountsPayableView` are updated for clarity. The `engines` property was removed from `package.json` as it's not strictly necessary for typical development workflows.

index.html

@@ -14,9 +14,9 @@
       
       body {
         font-family: 'Akzidenz Grotesk', 'Helvetica Neue', Helvetica, Arial, sans-serif;
-        background-color: #F8FAFC;
+        background-color: #F8FAFC; /* Slate 50 */
       }
-
+      /* Custom scrollbar */
       ::-webkit-scrollbar {
         width: 8px;
         height: 8px;