Demo update: clearer targeting, tutorial guidance and room transitions

Thanks to everyone who tried the demo and shared feedback today! This update brings a few improvements:

• Aligned targeting arrow tips with the mouse cursor.

• Added clearer explanations of how Wound cards are gained.

• Added a confirmation when skipping the tutorial, explaining what it covers.

• Added a notice when attempting to return to the room you just left.

• Replaced the room transition text screen with a map transition showing newly revealed rooms.

Thanks for helping me improve Submundus.