refs https://github.com/TryGhost/Ghost/issues/9623
- add new `{{koenig-caption-input}}` component
- yield koenig-caption-input instance from the `{{koenig-card}}` component
- remove duplicated caption logic from image and embed cards
- remove placeholder when caption input has focus
refs https://github.com/TryGhost/Ghost/issues/9623
- update `{{koenig-card}}` to show the toolbar immediately if it has changed
- update `{{koenig-card-image}}` to only add toolbar items when an image is present
refs https://github.com/TryGhost/Ghost/issues/9623
- detect pastes that contain image files and insert a card for each, setting `payload.files` to the `File` instance grabbed from the clipboard
- update the `addComponent` hook to ensure the `payload.files` array is preserved, browsers do not allow `File` instances to be copied
- update `{{koenig-card-image}}` to look for a `payload.files` value to auto-upload it via it's internal `{{gh-uploader}}`
- NOTE: browser support for accessing image files on paste varies:
- Safari: will paste all images
- Chrome: will only paste the first image
- Firefox: will not paste any images
refs https://github.com/TryGhost/Ghost/issues/9505
- use Spirit classes for card context menu
- add button and icon class options for context menu items
- add ability to have icon+text for context menu items
- add "Edit" context menu item to markdown and html cards
refs https://github.com/TryGhost/Ghost/issues/9311
- add actions for cursor movement and pass through to card components
- `moveCursorToNextSection` deselects card and places cursor at beginning of next section, useful for caption inputs where <kbd>down arrow</kbd> or <kbd>right arrow</kbd> should move the cursor out of the input & card. Also creates an empty paragraph before moving the cursor if for some reason an empty paragraph doesn't exist after the last card in the doc
- `moveCursorToPrevSection` deselects card and places cursor at end of previous section, useful for caption inputs where <kbd>up arrow</kbd> or <kbd>left arrow</kbd> should move the cursor out of the input & card
- `addParagraphAfterCard` deselects card, creates a new paragraph after the card and moves the cursor to it. Useful for caption inputs where <kbd>enter</kbd> should have the same behaviour as if it was pressed whilst the card is selected
- modify `{{gh-uploader}}` so that it passes the FileList to it's `onStart` closure action. Useful for displaying previews when uploading images
- modify `{{koenig-card}}` toolbar display so that it can display text as well as icon buttons
- update `{{koenig-card-image}}` so that it has a full image uploader and caption input
refs https://github.com/TryGhost/Ghost/issues/9311
- adds the `koenig-card-image` card that renders an `<img>` element
- adds text expansion to convert markdown images into the new image card
