New file: core/game_overlay_integration.py
- Detects EU game process by name (entropia.exe, entropiauniverse.exe)
- Attaches Activity Bar as child window of game window
- Overlay moves and resizes with game window ('burned in' effect)
- Shows/hides based on game process running
- 2-second polling interval to check game status
Integration:
- Added to main.py alongside overlay_controller
- Properly starts and stops with app
- Console messages when game detected/ended
This makes the overlay truly part of the game window!