RenjiYuusei/Kasumi-Store ? reverse-engineered prompt

Build me an Android app called Kasumi Store that lets users browse, download, and install APK, APKS, and XAPK files in one place. I want it to handle installs with root if available, or use Shizuku or a session installer when there’s no root. It should also detect OBB files and copy them into the right Android folder automatically, and include basic file management like cache cleanup, junk file removal, search, and sorting by name, size, or download date.

Please also add the Roblox related features from the app idea, like logging in with a .ROBLOSECURITY cookie on rooted devices and an auto rejoin feature that can run in the background as a foreground service. There should be a simple sync section to back up and restore Delta config between devices, plus a page where I can paste a Platoboost or Platorelay link and tap a button to get the key without any extra setup.

Use Kotlin with Jetpack Compose and Material 3, dark theme by default, and a left side navigation drawer. If you need to check anything unclear, look up the current docs online.