fix(gamepad): Gamepad on macos often does not need fallback.

[Mxbonn]

        if sys.platform == "darwin":
            # NOTE: On macOS, pygame doesn’t reliably detect input from some controllers so we fall back to hidapi
        if self.hidapi_fallback:
            from .gamepad_utils import GamepadControllerHID as Gamepad
        else:
            from .gamepad_utils import GamepadController as Gamepad

GamepadControllerHID and GamepadController are not fully compatible. E.g. they have different joystick behaviour, it seems like GamepadControllerHID is mainly created as a fallback for the Logitech RumblePad 2 on macos (based on the comments).

From my own testing, the original Gamepad controller works fine on macos for the Xbox controller, thus it seems to make more sense to add the fallback as an explicit option instead of swapping it for every macos user.

[Copilot]

Pull request overview

Adjusts macOS gamepad handling so LeRobot doesn’t automatically switch all macOS users to the HIDAPI-based controller, keeping the default pygame controller and making HIDAPI an opt-in fallback.

Changes:

• Adds a hidapi_fallback flag to GamepadTeleop to control whether GamepadControllerHID or GamepadController is used.
• Emits a macOS warning when not using the HIDAPI fallback to help users troubleshoot controller detection issues.

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