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

scripts/managers/auth_manager.gd

@@ -143,10 +143,10 @@ func _get_device_id() -> String:
 	# Try to load saved device ID for consistent guest identity
 	var id_file := "user://device_id.txt"
 	if FileAccess.file_exists(id_file):
-		var file := FileAccess.open(id_file, FileAccess.READ)
-		if file:
-			var saved_id := file.get_as_text().strip_edges()
-			file.close()
+		var file_read := FileAccess.open(id_file, FileAccess.READ)
+		if file_read:
+			var saved_id := file_read.get_as_text().strip_edges()
+			file_read.close()
 			if not saved_id.is_empty():
 				return saved_id
 	
@@ -156,10 +156,10 @@ func _get_device_id() -> String:
 		device_id = str(randi()) + str(Time.get_ticks_msec())
 	
 	# Save for future use
-	var file := FileAccess.open(id_file, FileAccess.WRITE)
-	if file:
-		file.store_string(device_id)
-		file.close()
+	var file_write := FileAccess.open(id_file, FileAccess.WRITE)
+	if file_write:
+		file_write.store_string(device_id)
+		file_write.close()
 	
 	return device_id