test: account for conditional Changes navigation

tests/e2e/test_mobile_search_preview_navigation.py

@@ -51,8 +51,10 @@ def test_rendered_mobile_search_preview_navigation_preserves_reading_space_and_d
         assert watch_bounds and watch_bounds["height"] >= 44
         navigation = page.locator(".mobile-search-preview-nav")
         expect(navigation).to_be_visible()
-        buttons = navigation.locator("button")
+        buttons = navigation.locator("button:visible")
+        assert navigation.locator("button").count() == 5
         assert buttons.count() == 4
+        expect(navigation.locator('[data-search-preview-section="changes"]')).to_be_hidden()
         for button in buttons.all():
             bounds = button.bounding_box()
             assert bounds and bounds["height"] >= 44