fix(editor): revert bg color of attachments when loading or error states (#12061)

Closes: [BS-3379](https://linear.app/affine-design/issue/BS-3379/恢复在-loading-或错误时-attachments-的背景色)

<!-- This is an auto-generated comment: release notes by coderabbit.ai -->
## Summary by CodeRabbit

- **Style**
  - Updated the background color of attachment cards in loading and error states for a more consistent appearance.
- **Bug Fixes**
  - Improved the handling and display of loading and uploading states for attachment cards to better reflect their current status.
- **Chores**
  - Added new workspace dependencies and project references to enhance synchronization capabilities across related modules.
<!-- end of auto-generated comment: release notes by coderabbit.ai -->

blocksuite/affine/blocks/attachment/package.json

@@ -21,6 +21,7 @@
     "@blocksuite/icons": "^2.2.12",
     "@blocksuite/std": "workspace:*",
     "@blocksuite/store": "workspace:*",
+    "@blocksuite/sync": "workspace:*",
     "@floating-ui/dom": "^1.6.13",
     "@lit/context": "^1.1.2",
     "@preact/signals-core": "^1.8.0",