feat: Implement core player movement with advanced pushing mechanics, define game modes, and introduce various new managers and UI components.

scripts/ui/settings_menu.gd

@@ -26,7 +26,9 @@ var listening_action: String = "" # Set when waiting for a keypress
 func _ready():
 	# Theme inheritance is broken by CanvasLayer root, no need for theme = null
 	_load_ui_values()
-	_connect_signals()
+	
+	if SettingsManager:
+		_connect_signals()
 	
 	# Initial visibility
 	visible = false
@@ -165,7 +167,7 @@ func _update_all_key_labels():
 
 func _update_key_label(action_name: String):
 	var btn = get_node_or_null("%" + action_name.to_pascal_case() + "Btn")
-	if btn:
+	if btn and SettingsManager:
 		btn.text = SettingsManager.get_control_text(action_name)
 		btn.modulate = Color.WHITE