feat: add juggling gym and animate circus sign

app/scripts/app_shell.gd

@@ -4,6 +4,7 @@ extends Node
 
 const MAIN_MENU_SCENE := preload("res://menus/scenes/main_menu.tscn")
 const JUGGLEBOARD_SCENE := preload("res://games/juggleboard/scenes/juggleboard.tscn")
+const JUGGLING_GYM_SCENE := preload("res://games/juggling_gym/scenes/juggling_gym.tscn")
 
 var main_menu: MainMenuController
 var active_game: Node
@@ -19,6 +20,7 @@ func _create_menus() -> void:
 	# P2A avvia direttamente Target: il vecchio dialog Target/Infinita non viene
 	# più creato né mostrato.
 	main_menu.mode_requested.connect(_start_juggleboard)
+	main_menu.gym_requested.connect(_start_juggling_gym)
 	main_menu.exit_requested.connect(_exit_app)
 	add_child(main_menu)
 
@@ -29,6 +31,10 @@ func _show_debug_target_or_home() -> void:
 		_start_juggleboard()
 		if args.has("--capture-menus"):
 			_capture_game_after_frame()
+	elif args.has("--start-gym"):
+		_start_juggling_gym()
+		if args.has("--capture-menus"):
+			_capture_gym_after_frame()
 	elif args.has("--capture-mode-dialog"):
 		# Compatibilità del flag di debug: il dialog non fa più parte del flusso.
 		main_menu.show_juggle()
@@ -47,6 +53,13 @@ func _return_to_juggle_menu() -> void:
 	main_menu.show_juggle()
 
 
+func _return_to_gym_menu() -> void:
+	if is_instance_valid(active_game):
+		active_game.queue_free()
+		active_game = null
+	main_menu.show_gym()
+
+
 func _start_juggleboard() -> void:
 	main_menu.hide_menu()
 	if is_instance_valid(active_game):
@@ -56,11 +69,25 @@ func _start_juggleboard() -> void:
 	add_child(active_game)
 
 
+func _start_juggling_gym() -> void:
+	main_menu.hide_menu()
+	if is_instance_valid(active_game):
+		active_game.queue_free()
+	active_game = JUGGLING_GYM_SCENE.instantiate()
+	active_game.return_requested.connect(_return_to_gym_menu)
+	add_child(active_game)
+
+
 func _capture_game_after_frame() -> void:
 	await RenderingServer.frame_post_draw
 	get_viewport().get_texture().get_image().save_png("/tmp/autgame_juggleboard.png")
 
 
+func _capture_gym_after_frame() -> void:
+	await RenderingServer.frame_post_draw
+	get_viewport().get_texture().get_image().save_png("/tmp/autgame_juggling_gym.png")
+
+
 func _exit_app() -> void:
 	if not OS.has_feature("web"):
 		get_tree().quit()