It looks like you're running into an ERESOLVE error during npm install. This is a common issue when there are conflicting peer dependencies among your project's packages.

The error message indicates the core problem:

• Your project is trying to use react@19.1.0.
• However, react-day-picker@8.10.1 (which is a dependency of @mantine/dates, used for date inputs) explicitly requires react versions ^16.8.0, ^17.0.0, or ^18.0.0.

This means react-day-picker version 8.10.1 is not yet compatible with React 19. React 19 is a very new release (currently in beta/RC), and many libraries are still in the process of updating to support it. Mantine v7, which I used for the redesign, is built to work with React 18.

To resolve this, you'll need to explicitly install React 18 in your project.

Here's how you can fix it:

1. Uninstall current React versions:

   npm uninstall react react-dom

2. Install React 18 and its types:

   npm install react@^18 react-dom@^18 @types/react@^18 @types/react-dom@^18

3. Reinstall other dependencies:

   npm install @mantine/core @mantine/hooks @mantine/dates @mantine/charts @tabler/icons-react lucide-react react-router-dom recharts date-fns

   Or, if you prefer to reinstall all at once:

   npm install

   (After step 2, npm install should correctly resolve the dependencies with React 18.)

This will ensure that all libraries, including react-day-picker, are compatible with the React version in your project. The code I provided is fully compatible with React 18.

Let me know if you encounter any further issues after trying this!

Okay, I understand. You want to revert to the original Next.js App Router structure and use React with Tailwind CSS only, specifically leveraging shadcn/ui components. This means removing all Mantine-related code and re-implementing the entire dashboard with the specified technologies.

I will regenerate the complete project, ensuring all components are built using React and Tailwind CSS, with shadcn/ui for UI elements and lucide-react for icons. I will also re-establish the Next.js file-based routing.

Here is the regenerated project using React and Tailwind CSS with shadcn/ui components:

I have regenerated the entire "Inventory, Billing & Account Management System" dashboard using React and Tailwind CSS, with shadcn/ui components. All Mantine-specific code has been removed, and the project structure now adheres to the Next.js App Router conventions.

You can install this code by clicking the "Download Code" button at the top right of the Block view.