fix(candy-survival): disable special tiles spawning in arena, reward ghost charge every 2 completed missions

scripts/managers/candy_survival_manager.gd

@@ -252,6 +252,10 @@ func _process(delta: float) -> void:
 func on_blueprint_completed(pid: int, primary_tile_id: int, off_color: bool) -> void:
 	player_blueprints[pid] = player_blueprints.get(pid, 0) + 1
 	
+	if player_blueprints[pid] % 2 == 0:
+		if multiplayer.is_server():
+			add_ghost_charge(pid)
+	
 	var target_tile_id = primary_tile_id
 	var player_node: Node = null
 	if main_scene:
@@ -500,7 +504,7 @@ func setup_mission_tiles() -> void:
 			if sticky_cells.has(Vector2i(x, y)):
 				continue
 			if randf() < 0.6:
-				var tile = 14 if randf() < 0.15 else tile_ids[randi() % tile_ids.size()]
+				var tile = tile_ids[randi() % tile_ids.size()]
 				gridmap.set_cell_item(Vector3i(x, 1, y), tile)
 				count += 1
 	print("[CandySurvival] Spawned %d mission tiles" % count)