More cleanup, focus bug fixes (#1749)

This PR is another grab bag:
- renames `readOnly` to `readonly` throughout editor
- fixes a regression related to focus and keyboard shortcuts
- adds a small outline for focused editors

### Change Type

- [x] `major`

### Test Plan

- [x] End to end tests

packages/editor/src/lib/hooks/useCanvasEvents.ts

@@ -80,7 +80,9 @@ export function useCanvasEvents() {
 
 			function onTouchStart(e: React.TouchEvent) {
 				;(e as any).isKilled = true
-				document.body.click() // god damn it, but necessary for long presses to open the context menu
+				// todo: investigate whether this effects keyboard shortcuts
+				// god damn it, but necessary for long presses to open the context menu
+				document.body.click()
 				preventDefault(e)
 			}