Refactor save management; update validation logic in save_manager.gd and enhance action handling in actions.gd for improved data integrity and user experience

stage/stage.gd

@@ -5,6 +5,7 @@ const OWNIVERSE_ITEM = preload("uid://d3xjfxwe3w16v")
 const SPEED_TEXTURE_NAME_TEMPLATE = "res://ui/topmenu/time&speed/time%s.png"
 
 const PAGE_COUNT = 5
+const RESOURCE_PAGE = 1
 const PAGE_WIDTH = 1080
 const DRAG_TOLERANCE = 360
 const SWIPE_DURATION: float = 0.4
@@ -256,7 +257,12 @@ func _set_active_page_actions() -> void:
         #var amount = owniverse.get_available_to_produce(entity)
         var amount = owniverse.calculate_max_producible(entity)
         #print(item_id, " : ", amount)
-        page_actions[pa].set_actions(item_id, amount)        
+        if item_id == "SMBH":
+            var preview: Callable = func(requested: float) -> float:
+                return owniverse.calculate_max_producible(entity, requested)
+            page_actions[pa].set_actions(item_id, amount, preview)
+        else:
+            page_actions[pa].set_actions(item_id, amount)
 
 
 func _page_action_pressed(page_id: int, action_amount: float) -> void:
@@ -329,7 +335,7 @@ 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:
+func _on_topmenu_button_pressed(_ButtonName) -> void:
     print("Debug → ")
     #, owniverse.state)
     for id in owniverse.state.batches:
@@ -359,6 +365,9 @@ func _on_unlock_and_save_timeout() -> void:
 func load_data() -> bool:
     var game_data: Dictionary = SaveManager.load_data("owniverse", "qwerty")
     if game_data.is_empty():
+        if SaveManager.last_error == "":
+            pending_page = RESOURCE_PAGE
+            _restore_page.call_deferred()
         return false
     var restored: Dictionary = game_data.state
     # Current definitions are initialized first; reject incompatible saves before publishing.