This PR makes a small improvement to the way we measure distances.
(Often we measure distances multiple times per frame per shape on the
screen). In many cases, we compare a minimum distance. This makes those
checks faster by avoiding a square root.
### Change Type
- [x] `sdk` — Changes the tldraw SDK
- [x] `improvement` — Improving existing features
### Release Notes
- Improve performance of minimum distance checks.
This one is a roundup of superficial changes, apologies for having them
in a single PR.
This PR:
- does some chair re-arranging for one of our hotter paths related to
updating shapes
- changes our type exports for editor components
- adds shape indicator to editor components
- moves canvas to be an editor component
- fixes a CSS bug with hinted buttons
- fixes CSS bugs with the menus
- fixes bad imports in examples
### Change Type
- [x] `major`
Steve Ruiz