Modstack-Launcher/ModstackApp ? reverse-engineered prompt

Build me a polished desktop app for Minecraft that lets people manage everything in one place. I want a beautiful launcher where you can create and open separate game profiles, choose the Java version, pick common loaders like Vanilla, Fabric, Forge, or NeoForge, and install mods and resource packs from popular sources without leaving the app. It should also support Minecraft Bedrock, including finding an existing install, managing updates, and launching it.

Please include a skins area too, where someone can preview their skin on a 3D model, change skins through their account, and use local skins for offline play. Add settings for game memory, fullscreen, install location, animations, and a few launcher preferences like Rich Presence and hide on launch. It should feel fast, modern, and easy to use, with real progress updates, logs for each instance, and import and export for shared profiles. If you need to look up current docs online, go ahead.