refs https://github.com/TryGhost/Team/issues/931
- prototype button has served it's purpose in answering questions and is no longer being used
- groundwork is left in place for future component-based atoms
refs https://github.com/TryGhost/Team/issues/931
- adds handling for component atoms
- add prototype button atom to test atom behaviour
- add `Cmd+Shift+B` keyboard shortcut to create a dummy button atom when the `emailCardSegments` feature is enabled
no issue
- show the toolbar icon for any `<KoenigCard>` instance that has the `saveAsSnippet` action passed to it
- currently that's all cards except the HR card because that's a primitive element rather than containing any user-defined content
- add `koenigUi.inputHasFocus` so that card toolbars can be hidden when the snippet input is displayed
