* Revert "Update preact example to match @astrojs/preact ranges (#4840)"
This reverts commit d650a1161a.
* Revert "[ci] format"
This reverts commit e3c78c5b16.
* Revert "Support shared signals in Preact islands (#4763)"
This reverts commit 5e46be5468.
* Support signals in Preact islands
* Add a changeset
* Only add signals if we need them
* Refactor signal logic into its own module
* Keep track of the signals used
