feat: Introduce core game systems for special tile effects, power-up management, player movement, and initial UI screens.

scripts/managers/special_tiles_manager.gd

@@ -34,7 +34,7 @@ func get_skill_affected_area(effect: int, center_pos: Vector2i) -> Array[Vector2
 	
 	match effect:
 		SpecialEffect.AREA_FREEZE:
-			# Preview 3 blocks ahead of current hover (if we ever re-enable targeting)
+			# Preview 2 blocks ahead of current hover (if we ever re-enable targeting)
 			area.append(center_pos)
 						
 		SpecialEffect.BLOCK_FLOOR:
@@ -190,6 +190,11 @@ func activate_effect(effect: int, target_player: Node3D = null):
 		print("PowerUp %s on cooldown." % SpecialEffect.keys()[effect])
 		return
 		
+	# Check Attack Mode Restriction
+	if player.get("is_attack_mode") and effect == SpecialEffect.INVISIBLE_MODE:
+		NotificationManager.send_message(player, "Cannot enter Ghost mode while in Attack Mode!", NotificationManager.MessageType.WARNING)
+		return
+
 	# Check Carrying Restriction
 	if player.get("is_carrying_tekton") and effect != SpecialEffect.FASTER_SPEED:
 		NotificationManager.send_message(player, "Cannot use this power while carrying a Tekton!", NotificationManager.MessageType.WARNING)
@@ -250,9 +255,9 @@ func _execute_area_freeze(target_pos: Vector2i = Vector2i.ZERO):
 	
 	if center_pos == Vector2i.ZERO:
 		# Calculate distance ahead based on Level
-		# Gap of 3 floors = 4 tiles ahead
-		# Gap of 5 floors = 6 tiles ahead
-		var distance = 4 if current_lvl < 5 else 6
+		# Gap of 2 floors = 3 tiles ahead
+		# Gap of 4 floors = 5 tiles ahead
+		var distance = 3 if current_lvl < 5 else 5
 		
 		var movement = player.movement_manager
 		if movement and movement.current_move_direction != Vector2i.ZERO: