feat: Implement core multiplayer lobby system with room management, player profiles, and game settings.

scripts/managers/lobby_manager.gd

@@ -293,7 +293,7 @@ func set_player_name(new_name: String) -> void:
 			break
 	
 	# Sync to all peers if connected
-	if multiplayer.has_multiplayer_peer():
+	if multiplayer.has_multiplayer_peer() and multiplayer.multiplayer_peer.get_connection_status() == MultiplayerPeer.CONNECTION_CONNECTED:
 		rpc("sync_player_name", my_id, new_name)
 	
 	emit_signal("player_list_changed")

scripts/managers/user_profile_manager.gd

@@ -120,17 +120,25 @@ func load_stats() -> Dictionary:
 # =============================================================================
 
 func update_display_name(new_name: String) -> bool:
-	if not NakamaManager.session:
-		emit_signal("profile_update_failed", "Not authenticated")
-		return false
-	
 	if new_name.strip_edges().is_empty():
 		emit_signal("profile_update_failed", "Display name cannot be empty")
 		return false
 	
-	if new_name.length() > 50:
-		emit_signal("profile_update_failed", "Display name too long (max 50 characters)")
+	if new_name.length() > 6:
+		emit_signal("profile_update_failed", "Display name too long (max 6 characters)")
 		return false
+		
+	var regex = RegEx.new()
+	regex.compile("^[A-Za-z]+$")
+	if not regex.search(new_name):
+		emit_signal("profile_update_failed", "Name must contain only letters")
+		return false
+
+	# Allow guest name updates locally
+	if not NakamaManager.session or AuthManager.is_guest:
+		profile["display_name"] = new_name
+		emit_signal("profile_updated")
+		return true
 	
 	var result: NakamaAsyncResult = await NakamaManager.client.update_account_async(
 		NakamaManager.session,

scripts/ui/profile_panel.gd

@@ -40,6 +40,7 @@ func _load_profile_data() -> void:
 	
 	# Display name
 	display_name_input.text = profile.get("display_name", "Guest")
+	display_name_input.max_length = 6
 	
 	# Avatar
 	var avatar_url: String = UserProfileManager.get_avatar_url()
@@ -132,9 +133,13 @@ func _on_save_name_pressed() -> void:
 	save_name_btn.disabled = false
 	
 	if success:
+		status_label.add_theme_color_override("font_color", Color.GREEN)
 		status_label.text = "Name updated!"
 		emit_signal("profile_updated")
+		await get_tree().create_timer(3.0).timeout
+		status_label.text = ""
 	else:
+		status_label.add_theme_color_override("font_color", Color.RED)
 		status_label.text = "Failed to update name"
 
 func _on_link_account_pressed() -> void:
@@ -187,7 +192,10 @@ func _on_profile_updated() -> void:
 	_load_profile_data()
 
 func _on_profile_update_failed(error: String) -> void:
+	status_label.add_theme_color_override("font_color", Color.RED)
 	status_label.text = error
+	await get_tree().create_timer(3.0).timeout
+	status_label.text = ""
 
 func show_panel() -> void:
 	_load_profile_data()