- D-pad Left -> F3 debug overlay, D-pad Right -> chat (rising-edge XInput poll on the CoreWindow thread)
- Mirror ChatScreen open state into g_xbox_chatOpen so the Xbox soft keyboard (IInputPane2) actually shows/hides
- Add XboxOnKeyUp export and pair every CoreWindow KeyDown/KeyUp + D-pad press/release so g_KBMInput's released-edge handlers fire (fixes F3 toggle and chat re-opening)
- Bump version to 1.2.1.0