webcatalog/webcatalog-legacy ? reverse-engineered prompt

Build me the WebCatalog desktop app that turns websites into separate desktop apps, kind of like a simple app launcher for web services. I want a clean Electron style app that works on macOS, Windows, and Linux, with a polished interface for browsing and managing web apps, opening them in their own windows, and making them feel like real desktop apps instead of just tabs in a browser.

Please make it feel reliable and production ready, with the usual desktop app stuff like startup behavior, app icons, packaging for the different operating systems, and a smooth React based UI. If you need current implementation details, look up the latest docs online and follow the existing setup in the repo. Keep it focused on the core WebCatalog experience, and make sure it can run locally and be built for release.