feat: implement core lobby management system with Nakama integration, player state, and game settings.

scenes/main.gd

@@ -29,6 +29,8 @@ func _ready():
 	# Connect to multiplayer signals
 	multiplayer.peer_connected.connect(_on_peer_connected)
 	multiplayer.peer_disconnected.connect(_on_peer_disconnected)
+	LobbyManager.host_disconnected.connect(_on_host_disconnected)
+	LobbyManager.game_starting.connect(_on_rematch_starting)
 	
 	# Connect to Nakama signals
 	NakamaManager.match_joined.connect(_on_match_joined)
@@ -1200,11 +1202,73 @@ func add_newly_connected_player_character(new_peer_id: int):
 
 func _on_peer_disconnected(peer_id: int):
 	if multiplayer.is_server():
-		GameStateManager.remove_player(peer_id)
-		if GameStateManager.enable_bots:
-			var next_id = PlayerManager.get_next_available_bot_id(GameStateManager.max_players, GameStateManager.players)
-			if next_id != -1:
-				_add_bot(next_id)
+		print("[Main] Peer %d disconnected. Checking for bot replacement..." % peer_id)
+		
+		var player_node = get_node_or_null(str(peer_id))
+		if player_node and not player_node.is_bot:
+			# Cache state before removing
+			var pos = player_node.current_position
+			var p_score = player_node.score
+			var p_goals = player_node.goals.duplicate()
+			var p_char = player_node.selected_character
+			
+			# Remove human player
+			GameStateManager.remove_player(peer_id)
+			player_node.queue_free()
+			
+			# Add replacement bot
+			if GameStateManager.enable_bots:
+				var next_bot_id = PlayerManager.get_next_available_bot_id(GameStateManager.max_players, GameStateManager.players)
+				if next_bot_id != -1:
+					print("[Main] Replacing Player %d with Bot %d" % [peer_id, next_bot_id])
+					_replace_player_with_bot(next_bot_id, pos, p_score, p_goals, p_char)
+		else:
+			GameStateManager.remove_player(peer_id)
+
+func _replace_player_with_bot(bot_id: int, pos: Vector2i, p_score: int, p_goals: Array, p_char: String):
+	"""Creates a bot to replace a disconnected player and restores their state."""
+	rpc("create_bot_with_state", bot_id, pos, p_score, p_goals, p_char)
+
+@rpc("call_local")
+func create_bot_with_state(bot_id: int, pos: Vector2i, p_score: int, p_goals: Array, p_char: String):
+	if not GameStateManager.enable_bots:
+		return
+	
+	if has_node(str(bot_id)):
+		return
+		
+	var bot_character = PlayerManager.create_bot(bot_id)
+	call_deferred("add_child", bot_character)
+	bot_character.add_to_group("Players", true)
+	bot_character.add_to_group("Bots", true)
+	
+	# Apply transferred state
+	bot_character.current_position = pos
+	bot_character.score = p_score
+	bot_character.goals = p_goals
+	bot_character.selected_character = p_char
+	
+	if multiplayer.is_server():
+		GameStateManager.add_bot(bot_id)
+		# Ensure position is synced
+		bot_character.update_player_position(pos)
+
+func _on_host_disconnected():
+	"""Called when the host leaves. Returns clients to the main menu."""
+	print("[Main] Host disconnected. Match terminated. Returning to lobby...")
+	get_tree().change_scene_to_file("res://scenes/lobby.tscn")
+
+func _on_rematch_starting():
+	"""Called when a rematch is triggered. Reloads the game scene."""
+	print("[Main] Rematch starting! Resetting state and reloading scene...")
+	
+	# Reset singletons/managers that persist across scene reloads
+	GameStateManager.reset()
+	GoalManager.reset()
+	TurnManager.reset()
+	
+	is_match_ended = false
+	get_tree().change_scene_to_file("res://scenes/main.tscn")
 
 # =============================================================================
 # Turn Management (RPC Handlers)
@@ -1716,6 +1780,10 @@ func sync_game_end_portal_mode(winner_id: int):
 
 func _on_match_ended():
 	"""Called when the global match timer ends - show game over screen."""
+	if is_match_ended:
+		return
+		
+	is_match_ended = true
 	print("[Main] Match ended! Showing game over screen...")
 	
 	# Disable player controls
@@ -1927,7 +1995,39 @@ func _show_game_over_panel():
 		# Add local player entry
 		leaderboard_container.add_child(create_entry.call(local_player_rank))
 	
-	# Back to Menu button
+	# 3. Rematch Option
+	var rematch_container = HBoxContainer.new()
+	rematch_container.alignment = BoxContainer.ALIGNMENT_CENTER
+	rematch_container.add_theme_constant_override("separation", 20)
+	inner_vbox.add_child(rematch_container)
+	
+	var rematch_btn = Button.new()
+	rematch_btn.name = "RematchBtn"
+	rematch_btn.text = "REMATCH"
+	rematch_btn.custom_minimum_size = Vector2(200, 60)
+	rematch_btn.add_theme_font_size_override("font_size", 20)
+	rematch_btn.pressed.connect(func():
+		rematch_btn.disabled = true
+		rematch_btn.text = "VOTED"
+		LobbyManager.request_rematch.rpc(multiplayer.get_unique_id())
+	)
+	rematch_container.add_child(rematch_btn)
+	
+	var rematch_label = Label.new()
+	rematch_label.name = "RematchVoteLabel"
+	rematch_label.text = "0/2"
+	rematch_label.add_theme_font_size_override("font_size", 24)
+	rematch_label.add_theme_color_override("font_color", Color(0.7, 0.7, 0.7))
+	rematch_container.add_child(rematch_label)
+	
+	LobbyManager.rematch_votes_updated.connect(func(count, required):
+		if is_instance_valid(rematch_label):
+			rematch_label.text = "%d/%d" % [count, required]
+			if count >= required:
+				rematch_label.add_theme_color_override("font_color", Color.GREEN)
+	)
+
+	# 4. Back to Menu button
 	var back_btn = Button.new()
 	back_btn.name = "BackToMenuBtn"
 	back_btn.text = "BACK TO MAIN MENU"