Consolidate interpreter window access and replace WheelHandler singleton with ControlDeck-owned dependency

[Copilot]

This addresses two review points: removing redundant Interpreter window accessors and eliminating WheelHandler::GetInstance() in favor of explicit ownership. Wheel input state is now sourced through ControlDeck, which already sits on the controller/mapping path.

• Interpreter window access cleanup

  • Removed Interpreter::GetFast3dWindow() and kept a single access path via Interpreter::GetCurrentWindow().
  • GetCurrentWindow() now resolves the cached weak window pointer directly from the live interpreter instance.

• WheelHandler lifecycle/ownership

  • Removed singleton state and WheelHandler::GetInstance(...).
  • ControlDeck now creates/caches a WheelHandler during Init(...) and exposes it with GetWheelHandler().

• Wheel input call-site migration

  • Updated wheel-dependent mapping/factory code and control deck update path to consume wheel state through ControlDeck::GetWheelHandler().
  • This removes implicit global state access from wheel mapping logic.

// Before
WheelDirections wheelDirections = WheelHandler::GetInstance()->GetDirections();
Ship::WheelHandler::GetInstance()->Update();

// After
auto wheelDirections = controlDeck->GetWheelHandler()->GetDirections();
GetWheelHandler()->Update();