Plumb controller battery type/level from the GIP status packets
through the C API into the card header (SF Symbol battery icon).
Add a per-controller Rumble button wired to a new
xone_controller_rumble() entry point; it validates its arguments
and returns -ENOSYS until host to controller TX is implemented.
Co-Authored-By: qwen3.8-27b@q3_k_xl: battery + rumble button UI
portersky
416507ed53