feat: Implement Stop N Go game mode with phase management, mission objectives, and visual HUD elements.

scripts/managers/lobby_manager.gd

@@ -120,6 +120,9 @@ func refresh_room_list() -> void:
 
 func set_ready(is_ready: bool) -> void:
 	"""Set local player's ready state."""
+	if not multiplayer.has_multiplayer_peer():
+		return
+		
 	var my_id = multiplayer.get_unique_id()
 	
 	# Update local state
@@ -248,6 +251,10 @@ func set_character(character_name: String) -> void:
 		return
 	
 	local_character_index = idx
+	
+	if not multiplayer.has_multiplayer_peer():
+		return
+		
 	var my_id = multiplayer.get_unique_id()
 	
 	# Update local player data
@@ -289,6 +296,11 @@ func sync_character(player_id: int, character_name: String) -> void:
 func set_player_name(new_name: String) -> void:
 	"""Set local player's name. Syncs to all peers."""
 	local_player_name = new_name
+	
+	if not multiplayer.has_multiplayer_peer():
+		emit_signal("player_list_changed")
+		return
+		
 	var my_id = multiplayer.get_unique_id()
 	
 	# Update local player data
@@ -412,6 +424,9 @@ func _on_match_joined(match_id: String) -> void:
 	var short_id = match_id.substr(0, 8) if match_id.length() > 8 else match_id
 	current_room["room_name"] = short_id
 	
+	if not multiplayer.has_multiplayer_peer():
+		return
+		
 	# Add self to player list
 	var my_id = multiplayer.get_unique_id()
 	var my_data = {