feat: Add lobby and multiplayer room management with Nakama and ENet LAN support.

scripts/managers/lobby_manager.gd

@@ -359,8 +359,8 @@ func sync_ready_state(player_id: int, is_ready: bool) -> void:
 
 func _check_all_ready() -> void:
 	"""Check if all players are ready."""
-	# In LAN mode allow solo play - only 1 player needed
-	var min_players = 1 if is_lan_mode else 2
+	# Allow solo play in both LAN and Nakama modes
+	var min_players = 1
 	if players_in_room.size() < min_players:
 		_all_ready = false
 		return
@@ -373,17 +373,6 @@ func _check_all_ready() -> void:
 	_all_ready = true
 	emit_signal("all_players_ready")
 
-func force_solo_ready() -> void:
-	"""Mark the local player as ready immediately (for solo LAN play)."""
-	if not multiplayer.has_multiplayer_peer():
-		return
-	var my_id = multiplayer.get_unique_id()
-	for player in players_in_room:
-		if player["id"] == my_id:
-			player["is_ready"] = true
-			break
-	_check_all_ready()
-
 func is_all_ready() -> bool:
 	return _all_ready
 
@@ -814,6 +803,7 @@ func _on_peer_connected(peer_id: int) -> void:
 		# Sync player list to all clients
 		rpc("sync_player_list", players_in_room)
 		emit_signal("player_joined", new_player)
+		_check_all_ready()
 	else:
 		# Client: if we connected to the host (peer_id 1), request room info
 		if peer_id == 1 and not is_host:

scripts/managers/stop_n_go_manager.gd

@@ -21,7 +21,7 @@ const POWERUP_SPAWN_COUNT: int = 5 # Number of power-up tiles to spawn
 var powerups_spawned: bool = false
 var stop_phase_occurred: bool = false
 
-var safe_zone_wall_scene = preload("res://scenes/wall_3d.tscn")
+var safe_zone_wall_scene = preload("res://scenes/safe_zone_wall.tscn")
 
 const PERMANENT_POWERUP_LOCATIONS: Array[Vector2i] = [
 	Vector2i(4, 1),   # Power up 1