fix(editor): unify file size formatting method (#12444)

Closes: [BS-3524](https://linear.app/affine-design/issue/BS-3524/统一文件大小单位，与-af-一致)

![Screenshot 2025-05-22 at 15.09.41.png](https://graphite-user-uploaded-assets-prod.s3.amazonaws.com/8ypiIKZXudF5a0tIgIzf/ddb6fa38-243f-4e65-b572-d476e3771d74.png)

![Screenshot 2025-05-22 at 15.09.48.png](https://graphite-user-uploaded-assets-prod.s3.amazonaws.com/8ypiIKZXudF5a0tIgIzf/5d182332-4d0a-419a-b206-df58552fe740.png)

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

- **Refactor**
  - Updated file size formatting throughout the app to use a new, consistent utility for displaying file sizes.
  - Improved clarity and uniformity of file size information in attachments, images, and related notifications.
  - Enhanced type support to explicitly allow null values for file size descriptions.
- **Bug Fixes**
  - Adjusted file size display in tests to match updated formatting standards.
<!-- end of auto-generated comment: release notes by coderabbit.ai -->

yarn.lock

@@ -3703,9 +3703,11 @@ __metadata:
     "@lit/context": "npm:^1.1.2"
     "@preact/signals-core": "npm:^1.8.0"
     "@toeverything/theme": "npm:^1.1.14"
+    "@types/bytes": "npm:^3.1.5"
     "@types/hast": "npm:^3.0.4"
     "@types/lodash-es": "npm:^4.17.12"
     "@types/mdast": "npm:^4.0.4"
+    bytes: "npm:^3.1.2"
     dompurify: "npm:^3.2.4"
     fractional-indexing: "npm:^3.2.0"
     lit: "npm:^3.2.0"