fix(candy-survival): connect Ghost charges to SpecialTilesManager powerup inventory, spawn Ghost tiles in arena, and support powerup button activations

scripts/managers/candy_survival_manager.gd

@@ -168,6 +168,7 @@ func start_game_mode() -> void:
 		player_sugar_rush[pid] = 0.0
 		player_last_knocked_by[pid] = 0
 		_update_candy_badge(pid)
+		_update_special_inventory_for_ghosts(pid)
 
 	print("[CandySurvival] Started with %d players" % pids.size())
 
@@ -420,6 +421,8 @@ func try_activate_ghost(pid: int) -> bool:
 	player_ghost_active[pid] = true
 	player_ghost_timer[pid] = GHOST_DURATION
 	rpc("sync_ghost_active", pid, true)
+	rpc("sync_ghost_charge_count", pid, player_ghosts[pid])
+	_update_special_inventory_for_ghosts(pid)
 	
 	# Core powerup integration: set is_invisible on the player node
 	var all_players = get_tree().get_nodes_in_group("Players")
@@ -488,7 +491,7 @@ func setup_mission_tiles() -> void:
 			if sticky_cells.has(Vector2i(x, y)):
 				continue
 			if randf() < 0.6:
-				var tile = tile_ids[randi() % tile_ids.size()]
+				var tile = 14 if randf() < 0.15 else tile_ids[randi() % tile_ids.size()]
 				gridmap.set_cell_item(Vector3i(x, 1, y), tile)
 				count += 1
 	print("[CandySurvival] Spawned %d mission tiles" % count)
@@ -650,3 +653,35 @@ func sync_state_to_player(peer_id: int) -> void:
 				if player.has_method("sync_candy_stack"):
 					player.rpc_id(peer_id, "sync_candy_stack", colors)
 				break
+
+func _update_special_inventory_for_ghosts(pid: int) -> void:
+	if not multiplayer.is_server():
+		return
+	if main_scene:
+		var player_node = main_scene.get_node_or_null(str(pid))
+		if player_node:
+			var st_manager = player_node.get_node_or_null("SpecialTilesManager")
+			if st_manager:
+				var has_charges = (player_ghosts.get(pid, 0) > 0)
+				if has_charges:
+					st_manager.rpc_id(pid, "sync_inventory_add", st_manager.SpecialEffect.INVISIBLE_MODE, 8)
+				else:
+					st_manager.rpc_id(pid, "sync_inventory_remove", st_manager.SpecialEffect.INVISIBLE_MODE)
+
+@rpc("any_peer", "call_local", "reliable")
+func add_ghost_charge(pid: int) -> void:
+	if not multiplayer.is_server():
+		return
+	player_ghosts[pid] = player_ghosts.get(pid, 0) + 1
+	rpc("sync_ghost_charge_count", pid, player_ghosts[pid])
+	_update_special_inventory_for_ghosts(pid)
+
+@rpc("authority", "call_local", "unreliable")
+func sync_ghost_charge_count(pid: int, count: int) -> void:
+	if not active:
+		activate_client_side()
+	if player_ghosts.has(pid) or pid == multiplayer.get_unique_id():
+		player_ghosts[pid] = count
+	if multiplayer.get_unique_id() == pid:
+		if hud_ghost_label:
+			hud_ghost_label.text = "👻 Ghosts: %d" % count