PunitDh/ostrta-client ? reverse-engineered prompt

Build me a clean modern dashboard web app like the live demo in the README, with a polished admin style layout, a sidebar, top bar, cards, tables, charts, and a responsive mobile friendly design.

I want it to feel like a real product dashboard, with a home overview page, a few sample widgets, and nice reusable UI sections that can be expanded later. Make the styling modern and light, with good spacing, readable typography, and a professional look.

Please use the existing project setup and keep it as a React app that works well with TypeScript. If you need anything from current libraries or docs, look it up online first. Make sure the app starts cleanly, the main dashboard is wired up, and the overall structure is easy to edit for future pages like analytics, customers, and settings.