This PR fixes the CSS for the page menu drag handle while editing. It
also makes the page menu participate in the `useMenuIsOpen` API.
### Change Type
- [x] `patch` — Bug Fix
### Test Plan
1. Select the draw tool
2. Open the page menu
3. Click on the canvas—there should be no dot!
4. Open the page menu
5. Click the edit icon
6. Hover the drag handle; the handle should look correct
### Release Notes
- Fix styling in the page menu
This PR lands a few changes to the UI that are relevant for the Snapshot
link feature (see https://github.com/tldraw/brivate/pull/1824).
### Change Type
- [x] `minor` — New Feature
This PR has been hijacked! 🗑️🦝🦝🦝
The <Canvas> component was previously split into an <SVGLayer> and an
<HTMLLayer>, mainly due to the complexity around translating SVGs.
However, this was done before we learned that SVGs can have overflow:
visible, so it turns out that we don't really need the SVGLayer at all.
This PR now refactors away SVG Layer.
It also updates the class name prefix in editor from `rs-` to `tl-` and
does a few other small changes.
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Co-authored-by: Steve Ruiz <steveruizok@gmail.com>
