feat: Add mouse wheel support for game input passthrough

- Implement mouse wheel event handling in SDL2 backend (emu_window_sdl2)
- Add wheel event routing from GRenderWindow to input subsystem
- Add debugging logs to trace mouse wheel events through input chain
- Support mouse wheel input for mods like Ultracam when games are running (WIP)

Signed-off-by: Zephyron <zephyron@citron-emu.org>

src/hid_core/frontend/emulated_devices.h

@@ -135,6 +135,9 @@ public:
     /// Returns the latest mouse wheel change
     AnalogStickState GetMouseWheel() const;
 
+    /// Resets the mouse wheel state (should be called each frame)
+    void ResetMouseWheel();
+
     /**
      * Adds a callback to the list of events
      * @param update_callback InterfaceUpdateCallback that will be triggered