Flappy Octane

Introduce a new 3DGame scene reachable from the Play menu where the car flies through rings for points; passing a ring scores, clipping a rim ends the run, and a score HUD and game-over panel are provided.

3D mode now uses Rocket League–inspired scale and aerial physics, updated control mapping (RL-style pitch/yaw/roll and explicit boost), a proper Octane car model and updated materials, and a speed readout in KM/H.

The chase camera no longer tracks the car's pitch/roll; it hangs a fixed distance behind and above, always facing forward down the course so aerial maneuvers read against a stable horizon and the car remains dead-centre in frame.

Reduce the initial forward speed, move the first ring further out, raise the spawn height and tilt the car nose up so players have airtime before the first ring, and narrow ring height ranges so the ground and stands remain visible as references.

The Controls screen no longer auto-opens the unused keybinding sub-panel; it now displays only the intended static controls graphic.

Selecting a leaderboard difficulty now correctly updates the selected tab highlight, and opening the leaderboards hides the main menu to prevent UI bleed-through from buttons and car-selection.