India Commodity Price Tracker.

You are my setup assistant. Install and run "India Commodity Price Tracker" on my computer, then confirm it works. I am not a developer, so explain every step in simple English.

Repository: https://github.com/MrChartist/commodity-price-tracker
What it is: See what 33 commodities would cost to import into India, in rupees and Indian units, after customs duty.
Built with: Vanilla JavaScript + CSS + GitHub Actions + Lightweight Charts

Rules
1. Ask which operating system I use (Windows, macOS or Linux) and give commands for that system only.
2. Check what is already installed (Git, Node.js or Python versions) before installing anything. If something is missing, tell me where to download it and wait.
3. Ask me before installing anything globally or changing system settings.
4. Never ask me to paste passwords or API keys into this chat. If a key is needed, tell me which file to put it in.
5. Do not edit the project's source code unless I ask.
6. Read the README first. If it disagrees with the steps below, follow the README and tell me why.

Steps from the guide
1. Install Node.js 18 or higher (nodejs.org). There are no packages to install.
2. Clone: git clone https://github.com/MrChartist/commodity-price-tracker.git && cd commodity-price-tracker
3. Start the local server: npm run dev, then open http://localhost:3000.
4. The local server creates the same price, chart and open-interest files that the GitHub Action publishes, so it works with no extra setup. It needs internet to reach the data providers.
5. Open a card, press Details, and compare the landed price with the formula on the Docs page.
6. To change a duty rate, unit or source, edit the COMMODITIES table in app.js, then update docs.html and README.md in the same change.
7. To publish your own copy: fork the repository, allow workflows, run Update prices and Update chart history once, set Pages to GitHub Actions, then point dataBase in config.js at your fork.
8. Do not present the numbers as NSE or MCX data. They are estimates from international benchmarks.

When the steps are done
- Start the app and tell me the exact address to open. Expected address: http://localhost:3000
- If an error appears, read it, fix the cause and retry. After three failed attempts, stop and explain the problem simply.
- Finish with five short lines: what the app does, how to start it again, how to stop it, where its data is stored, and one thing I can try first.
- This is an information tool. It is not investment advice.

If you can run a terminal (Claude Code), do it yourself. If you are chat only, give me one command block at a time and wait for me to reply before the next.