couple fixes and improvements for the LOD work.
- add `format=auto` for Cloudflare to send back more modern image
formats
- fix the broken asset logic that regressed (should not have looked at
`url`)
- fix stray parenthesis, omg
- rm the `useValueDebounced` function in lieu of just debouncing the
resolver. the problem was that the initial load in a multiplayer room
has a zoom of 1 but then the real zoom comes in (via the url) and so we
would double load all images 😬. this switches the debouncing to the
resolving stage, not making it tied to the zoom specifically.
### Change Type
<!-- ❗ Please select a 'Scope' label ❗️ -->
- [x] `sdk` — Changes the tldraw SDK
- [ ] `dotcom` — Changes the tldraw.com web app
- [ ] `docs` — Changes to the documentation, examples, or templates.
- [ ] `vs code` — Changes to the vscode plugin
- [ ] `internal` — Does not affect user-facing stuff
<!-- ❗ Please select a 'Type' label ❗️ -->
- [x] `bugfix` — Bug fix
- [ ] `feature` — New feature
- [ ] `improvement` — Improving existing features
- [ ] `chore` — Updating dependencies, other boring stuff
- [ ] `galaxy brain` — Architectural changes
- [ ] `tests` — Changes to any test code
- [ ] `tools` — Changes to infrastructure, CI, internal scripts,
debugging tools, etc.
- [ ] `dunno` — I don't know
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