Start the app from a terminal

FocusDrop is a Vite app, so it has to be built and served — opening index.html straight from the file manager can only ever show this page.

cd path/to/FocusDrop
npm install
npm run dev

Then open http://localhost:5173.

To run the production build instead: npm run build then npm run preview. Double-clicking dist/index.html will not work either — browsers block ES modules loaded over file://.