Close https://github.com/toeverything/AFFiNE/issues/13750
#### PR Dependency Tree
* **PR #13762** 👈
This tree was auto-generated by
[Charcoal](https://github.com/danerwilliams/charcoal)
<!-- This is an auto-generated comment: release notes by coderabbit.ai
-->
## Summary by CodeRabbit
* **New Features**
* Optional block properties are now supported (e.g., flat-table), with
default values applied automatically when not set.
* **Bug Fixes**
* More reliable initialization and syncing of block properties, ensuring
defaults appear consistently.
* Change notifications now correctly reflect updates to
optional/defaulted properties.
* **Tests**
* Added tests verifying optional property behavior, default application,
syncing, and change events.
<!-- end of auto-generated comment: release notes by coderabbit.ai -->
#### PR Dependency Tree
* **PR #13762** 👈
This tree was auto-generated by
[Charcoal](https://github.com/danerwilliams/charcoal)
L-Sun