…as needed)

Impacted files:
* `knowledge_panel_card.dart`: refactored the call to  `KnowledgePanelPage`
* `knowledge_panel_element_card.dart`: refactored the calls to `KnowledgePanelCard` and `KnowledgePanelGroupCard`
* `knowledge_panel_expanded_card.dart`: refactored the call to `KnowledgePanelElementCard`
* `knowledge_panel_group_card.dart`: refactored the call to `KnowledgePanelCard`
* `knowledge_panel_page.dart`: refactored the call to `KnowledgePanelExpandedCard`; we use a `Consumer` in order to refresh when the product is refreshed
* `knowledge_panel_page_template.dart`; refactored the call to `KnowledgePanelWidget`
* `knowledge_panels_builder.dart`: refactored the call to `KnowledgePanelElementCard`
* `new_product_page.dart`: refactored the call to `KnowledgePanelWidget`
* `simple_input_page.dart`: unrelated "vertical axis" for verbose buttons
* `summary_card.dart`: refactored the call to `KnowledgePanelPage`