feat(network): add selectable privacy-preserving discovery

ui/pause_menu.gd

@@ -25,7 +25,7 @@ signal return_to_title_requested
 signal reset_progress_requested
 signal quit_requested
 signal menu_visibility_changed(is_open: bool)
-signal join_game_requested(endpoint: String)
+signal join_game_requested(route: ConnectionRoute)
 
 enum ConfirmationAction {
 	NONE,
@@ -240,18 +240,29 @@ func _close_join_game() -> void:
 	_begin_root_entry(true)
 
 
-func _on_join_confirmation_requested(_endpoint: String) -> void:
+func _on_join_confirmation_requested(
+	_endpoint: String,
+	relayed: bool,
+) -> void:
 	if _action_in_progress or _root_transition_active:
 		_join_game_page.cancel_pending_join_confirmation()
 		return
 	_confirmation_action = ConfirmationAction.JOIN_ANOTHER
 	_confirmation_returns_to_join_game = true
+	var privacy_message := (
+		"this join uses a privacy relay. the other player sees the relay "
+		+ "address instead of your residential IP; the relay service still "
+		+ "handles both addresses and will not silently fall back to direct."
+		if relayed
+		else "this is a direct peer-to-peer connection, not a relay. the "
+		+ "remote host can see your public IP address. discovery room "
+		+ "addresses are not displayed or saved."
+	)
 	_confirmation_page.configure(
-		(
-			"join another game?\n\n"
-			+ "your progression will be saved first. current players will be "
-			+ "disconnected if you are hosting."
-		),
+		"join another game?\n\n"
+		+ "your progression will be saved first. current players will be "
+		+ "disconnected if you are hosting.\n\n"
+		+ privacy_message,
 		"save and join",
 		"cancel",
 		BubbleConfirmationPageType.InitialFocus.CONFIRM,
@@ -261,8 +272,8 @@ func _on_join_confirmation_requested(_endpoint: String) -> void:
 	_show_confirmation()
 
 
-func _on_confirmed_join_requested(endpoint: String) -> void:
-	join_game_requested.emit(endpoint)
+func _on_confirmed_join_requested(route: ConnectionRoute) -> void:
+	join_game_requested.emit(route)
 
 
 func report_network_error(message: String) -> void: