Invoicing that stays in your browser.

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

Repository: https://github.com/MrChartist/Invoice
What it is: Make GST invoices and keep simple books for your business, entirely inside your own browser.
Built with: React 19 + TypeScript + Vite 8 + Zustand + CSS Modules + html-to-image + jsPDF

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 22 or higher (nodejs.org). Older versions will not run the test suite.
2. Clone: git clone https://github.com/MrChartist/Invoice.git && cd Invoice
3. Install: npm install
4. Start the dev server: npm run dev, then open http://localhost:5173.
5. On first visit, choose a name and a PIN. Then open Settings and add your business profile: GSTIN, address, bank and UPI ID.
6. Create your first invoice and use Preview to download the PDF. Optionally load the sample data from the Dashboard to explore, and remove it later.
7. Open Settings, then Data & backup, and download a backup or connect a folder for automatic backups. Browser data is lost if you clear site data.
8. Before changing code, run: npm run typecheck && npm run lint && npm test && npm run build.

When the steps are done
- Start the app and tell me the exact address to open. Expected address: http://localhost:5173
- 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.