Refactor: Added explicit typing and void return types

- Introduced explicit typing to variables and functions across multiple scripts for better code clarity.
- Specified 'void' as the return type for functions that do not return a value.
- Removed redundant code in some scripts.

scenes/scripts/high_scores.gd

@@ -1,7 +1,7 @@
 extends Level
 class_name HighScoresScreen
 
-func _ready():
+func _ready() -> void:
 	update_game_state()
 	%BeeDeathLabel.text = Str.format_number(HighScoreMgr.loaded_data.total_bees_killed)
 	%HoneyCountLabel.text = Str.format_number(HighScoreMgr.loaded_data.total_honey_collected)
@@ -15,5 +15,5 @@ func _ready():
 
 	%MainMenuButton.connect("pressed", Callable(self, "on_main_menu_button_pressed"))
 
-func on_main_menu_button_pressed():
+func on_main_menu_button_pressed() -> void:
 	SceneMgr.load_scene("MAINMENU")