add_list_item() helper added to functional_tests.base; further propagated into .test_layout_and_styling, .test_list_item_validation, .test_my_lists & .test_simple_list_creation; all FTs passing locally (tho js-dependent FT still require nginx to serve scripts properly in docker or on server)

src/functional_tests/test_layout_and_styling.py

@@ -17,9 +17,7 @@ class LayoutAndStylingTest(FunctionalTest):
             delta=10,
         )
 
-        inputbox.send_keys('testing')
-        inputbox.send_keys(Keys.ENTER)
-        self.wait_for_row_in_list_table('1. testing')
+        self.add_list_item("testing")
         inputbox = self.get_item_input_box()
         self.assertAlmostEqual(
             inputbox.location['x'] + inputbox.size['width'] / 2,