chriz-3656/webdock ? reverse-engineered prompt

Build me a lightweight desktop app that turns my favorite websites into a clean dock instead of making me keep a million browser tabs open.

I want one app where I can add services like GitHub, Figma, Spotify, Slack, or any other website, then switch between them from a simple sidebar. Each site should open in its own isolated sandbox so logins and cookies stay separate, and it should feel fast and native instead of like a browser window with extra chrome. Make the UI minimal, polished, and dark mode friendly, with nice icons and smooth transitions.

It should work on Windows, macOS, and Linux, and I should be able to run it locally, add custom sites, and package it into installers for release. If you need current Electron docs or best practices, look them up online while building it.