ImranR98/Obtainium ? reverse-engineered prompt

Build me an Android app that lets me download and update my other apps directly from their source. I want to bypass the main app stores and get APKs straight from places like GitHub releases, GitLab, F-Droid, or even APKPure.

The app should let me add a source URL for an app I want to track, and then it should automatically check for new versions and send me a notification when an update is available. From there, I should be able to download and install the new version.

The interface needs to be clean and modern, showing a list of my tracked apps and their status. Please include a dark theme and support for Android's Material You color theming. It would also be great if there was a way to find and import configurations for popular apps that the community has already figured out.