StreamController (Elgato Stream Deck) USB Detection Fix

Problem

StreamController flatpak shows "not connected" despite device being detected by lsusb.

Cause

Flatpak sandboxing blocks USB device access by default.

Fix

flatpak override --user --device=all com.core447.StreamController

Restart StreamController after applying. This persists across reboots.

Originally documented ~Nov 2025.