feat: implement initial lobby scene with main menu, server browser, and networking options.

scenes/lobby.gd

@@ -12,6 +12,10 @@ extends Control
 # UI References - Server Selection
 @onready var server_option = $MainMenuPanel/VBoxContainer/ServerSelectionSection/ServerOption
 @onready var server_ip_input = $MainMenuPanel/VBoxContainer/ServerSelectionSection/ServerIPInput
+@onready var lan_section = $MainMenuPanel/VBoxContainer/ServerSelectionSection/LANSection
+@onready var lan_ip_input = $MainMenuPanel/VBoxContainer/ServerSelectionSection/LANSection/LANIPInput
+@onready var lan_host_btn = $MainMenuPanel/VBoxContainer/ServerSelectionSection/LANSection/LANHostBtn
+@onready var lan_join_btn = $MainMenuPanel/VBoxContainer/ServerSelectionSection/LANSection/LANJoinBtn
 
 # Leaderboard Reference
 @onready var leaderboard_btn = $MainMenuPanel/VBoxContainer/ButtonSection/LeaderboardBtn
@@ -154,6 +158,10 @@ func _ready():
 	if server_ip_input:
 		server_ip_input.text_submitted.connect(_on_server_ip_submitted)
 		server_ip_input.focus_exited.connect(func(): _on_server_ip_submitted(server_ip_input.text))
+	if lan_host_btn:
+		lan_host_btn.pressed.connect(_on_lan_host_pressed)
+	if lan_join_btn:
+		lan_join_btn.pressed.connect(func(): _on_lan_join_pressed(lan_ip_input.text if lan_ip_input else "127.0.0.1"))
 	
 	# Connect button signals - Room List
 	refresh_btn.pressed.connect(_on_refresh_pressed)
@@ -248,18 +256,58 @@ func _load_character_textures() -> void:
 
 func _on_server_option_selected(index: int) -> void:
 	if index == 0:
-		# Localhost
+		# Nakama Localhost
 		if server_ip_input: server_ip_input.visible = false
+		if lan_section: lan_section.visible = false
 		NakamaManager.set_server("localhost")
-	else:
-		# Remote
+	elif index == 1:
+		# Nakama Remote
 		if server_ip_input: server_ip_input.visible = true
+		if lan_section: lan_section.visible = false
 		if server_ip_input: NakamaManager.set_server(server_ip_input.text)
+	else:
+		# LAN Direct
+		if server_ip_input: server_ip_input.visible = false
+		if lan_section: lan_section.visible = true
 
 func _on_server_ip_submitted(new_text: String) -> void:
 	if server_option and server_option.selected == 1:
 		NakamaManager.set_server(new_text.strip_edges())
 
+func _on_lan_host_pressed() -> void:
+	"""Host a LAN game without Nakama."""
+	var player_name = player_name_input.text.strip_edges() if player_name_input else ""
+	if player_name.is_empty():
+		player_name = "Host"
+	LobbyManager.local_player_name = player_name
+	
+	if connection_status:
+		connection_status.text = "Starting LAN server..."
+	var ok = await LobbyManager.create_room_lan()
+	if not ok:
+		if connection_status:
+			connection_status.text = "Failed to start LAN server. Check port 7777."
+
+func _on_lan_join_pressed(host_ip: String) -> void:
+	"""Join a LAN game by entering the host's IP."""
+	var ip = host_ip.strip_edges()
+	if ip.is_empty():
+		if connection_status:
+			connection_status.text = "Enter the host's IP address."
+		return
+	
+	var player_name = player_name_input.text.strip_edges() if player_name_input else ""
+	if player_name.is_empty():
+		player_name = "Player"
+	LobbyManager.local_player_name = player_name
+	
+	if connection_status:
+		connection_status.text = "Connecting to %s..." % ip
+	var ok = LobbyManager.join_room_lan(ip)
+	if not ok:
+		if connection_status:
+			connection_status.text = "Failed to connect to %s. Is host running?" % ip
+
 func _setup_game_modes() -> void:
 	if not game_mode_option: return
 	game_mode_option.clear()
@@ -680,6 +728,13 @@ func _on_room_joined(room_data: Dictionary) -> void:
 	
 	_update_player_slots()
 	connection_status.text = "Connected to room"
+	
+	# LAN solo mode: host is auto-ready, enable Start Game immediately
+	if LobbyManager.is_lan_mode and is_host:
+		ready_btn.button_pressed = true
+		ready_btn.text = "READY ✓"
+		LobbyManager.force_solo_ready()
+		status_label.text = "LAN Solo — press Start Game when ready!"
 
 func _on_room_left() -> void:
 	_show_panel("main_menu")