Our `InFrontOfTheCanvas` UI override component (we don't have a default
implementation, it's just an entry point for sdk users to insert their
own UI) was being mounted outside of the UI react context subtree, which
is an error because it won't have access to important things like
translations and asset URLs. #3750 made this bug manifest as a thrown
error in our `context-toolbar` example, as reported in #3773.
To fix this I just moved the injection site of the `InFrontOfTheCanvas`
component to be within the UI context. It ends up in the same place in
the DOM.
This PR closes#3773
### Change Type
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- [x] `sdk` — Changes the tldraw SDK
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- [x] `bugfix` — Bug fix
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debugging tools, etc.
- [ ] `dunno` — I don't know
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29608838ef