WSTxda/SwitchAI ? reverse-engineered prompt

Build me an Android app called SwitchAI that helps people easily choose and launch their preferred AI assistant on the phone. It should let me pick from installed assistants, set a default assistant for the system, and switch between them quickly when I want. I’d like a clean modern interface that feels like Material 3, with a polished selector screen, settings, home screen widget, and a Quick Settings tile so I can start the assistant or open the selector fast.

Please make it work with voice input where the assistant supports it, and handle the case where an app isn’t installed by showing a helpful message or prompting me to install it. It should feel simple and reliable, focused on everyday use. If you need to check current Android docs or best practices, go ahead and look them up.