Add screen management to top menu and update button functionality; replace close button with back button

stage/stage.gd

@@ -61,6 +61,10 @@ const SWIPE_DURATION: float = 0.4
 @onready var g_time_minus: TextureButton = $World/TopMenu/TimeMinus
 @onready var g_time_plus: TextureButton = $World/TopMenu/TimePlus
 
+@onready var screens: Dictionary = {
+    "World": $World,
+    "MainMenu": $MainMenu
+}
 
 var g_tween: Tween = null
 var g_dragged_start: Vector2 = Vector2.ZERO
@@ -365,24 +369,11 @@ func _change_speed(delta: int) -> void:
         g_time_plus.texture_normal = load(SPEED_TEXTURE_NAME_TEMPLATE % str(speed + 1))
  
    
-func _on_topmenu_button_pressed(_ButtonName) -> void:
-    print("Debug → ")
-    #, owniverse.state)
-    for id in owniverse.state.batches:
-        var s = owniverse.state.batches[id].size()
-        if s != 0:
-            print(id, " → ", s)
-            #, owniverse.state.batches[id])
-            if id == 'HG':
-                print(owniverse.state.batches[id])
+func _on_topmenu_button_pressed(screen_name: String) -> void:
+    
+    for screen_id in screens:
+        screens[screen_id].visible = screen_id == screen_name
     
-    #var s: float = 1E15
-    #var z = 1.0
-    #for i in range(30):
-        #print(i, " | ", z, " | ", " | ", s - z)
-        #z *= 10
-    print("-------")
-
 
 func _on_unlock_and_save_timeout() -> void:
     save_data()