Pico-Developer/PICO-Spatial-SDK-Sample-WelcomeSpace ? reverse-engineered prompt

Build me a PICO Spatial SDK sample app called Welcome Space for PICO OS 6.

I want a clean Kotlin Android project that opens into a home screen where users can browse a furniture catalog, inspect a 3D model up close in a floating window, and then enter an immersive room to place furniture around the space. The model viewer should let people drag to rotate, pinch to zoom, and use simple controls like auto rotate, lighting, name tag, and reset. In the room view, show clear placement feedback when an item is being selected or moved.

Please set it up with a modular structure so the app UI, data, and 3D resources are separated, and make sure it supports loading the editor asset bundle and a room scene with predefined target nodes. Use the Spatial SDK patterns for WindowContainers, Stage, and cross screen navigation, and keep the loading responsive with async work. If anything about the latest PICO Spatial SDK setup is unclear, look up the current docs online.