refs https://github.com/TryGhost/Team/issues/926
- updated `<KoenigEditor>` so it creates default card payloads as TrackedObject instances so that getters in glimmer component based cards can track changes to payload properties
- added dropdown free/paid selector to email-cta card that sets the `segment` payload property to the respective filter
- updated design to show the footer outside of edit mode too so that the selected segment is always visible
no issue
- switched to native class syntax
- updated to glimmer/octane syntax
- fixed infinite render issue from `<KoenigTextReplacementHtmlInput>`'s `didReceiveAttrs()` lifecycle hook
refs https://github.com/TryGhost/Team/issues/910
- readying the foundation for adding segment selection and CTA config to the `email-cta` card
- will only be available to select from card menus when the `emailCardSegments` feature flag is enabled
