SurvivorGrim/PipBoy-Pi5 ? reverse-engineered prompt

Build me a Fallout style Pip Boy for a Raspberry Pi 5 that actually boots into a full screen interface and runs on a 3.5 inch touchscreen. I want it to feel like the real prop, with the rotary knob and 10 position switch working for navigation, plus sound through a small USB speaker and an LED for the front light.

Use the existing PipBoy folder structure and make sure the Python app starts automatically when the Pi turns on. It should be set up for the Pi screen rotation and the touchscreen size in the guide, and include whatever code and instructions are needed to make the buttons, encoder, and audio work together smoothly. If you need to check current docs for the Raspberry Pi or libraries, look them up online.

Keep it simple enough that someone can follow the build, install the dependencies, copy the files over, and get the device running without having to figure out a bunch of missing steps.