Make editing cards less squashed on small screens

[jkomoros]

Make it possible to minimize the card editor. A zippy. When minimized, just display:none the main body of the editor. (editing + editorMinimized two different fields) In the future have little summaries of problems in the minimized section

Close the card drawer when editing?

[jkomoros]

• [ ] Make it so card-view doesn't know about editorMinimized, styling comes from within card-editor if it's active/and-or-minimized (it currently does still require it for card-stage resizing)
• [ ] Remove the weird position.absolute only when container.not-minimized in card-editor
• [x] Card stage resize also driven by editorMinimized
• [ ] Add a message about why editor is minimized
• [x] Clicking hte "Editing" label should also toggle editorMinimized (make sure it hovers like small button to show it's clickable and they hover style together)
• [x] Remove the checkboxs when editor is minimized
• [x] Show little summary information when editor minimized (e.g. number of suggested concepts, number of errors, a list of auto and explicit todos (and the drop down to add a todo)
• [ ] Handle a cramped minimized card editor (e.g. lots and lots of concept tags)
• [ ] Automatically minimize editor on small screens