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 -->

blocksuite/affine/shared/src/utils/index.ts

@@ -25,3 +25,4 @@ export * from './title';
 export * from './url';
 export * from './virtual-padding';
 export * from './zod-schema';
+export { default as formatSize } from 'bytes';

blocksuite/affine/shared/src/utils/math.ts

@@ -7,39 +7,3 @@ export function rangeWrap(n: number, min: number, max: number) {
   n = (n - min + max) % max;
   return min + (Number.isNaN(n) ? 0 : n);
 }
-
-/**
- * Format bytes as human-readable text.
- *
- * @param bytes Number of bytes.
- * @param si True to use metric (SI) units, aka powers of 1000. False to use
- *           binary (IEC), aka powers of 1024.
- * @param dp Number of decimal places to display.
- *
- * @return Formatted string.
- *
- * Credit: https://stackoverflow.com/questions/10420352/converting-file-size-in-bytes-to-human-readable-string
- */
-export function humanFileSize(bytes: number, si = true, dp = 1) {
-  const thresh = si ? 1000 : 1024;
-
-  if (Math.abs(bytes) < thresh) {
-    return bytes + ' bytes';
-  }
-
-  const units = si
-    ? ['kB', 'MB', 'GB', 'TB', 'PB', 'EB', 'ZB', 'YB']
-    : ['KiB', 'MiB', 'GiB', 'TiB', 'PiB', 'EiB', 'ZiB', 'YiB'];
-  let u = -1;
-  const r = 10 ** dp;
-
-  do {
-    bytes /= thresh;
-    ++u;
-  } while (
-    Math.round(Math.abs(bytes) * r) / r >= thresh &&
-    u < units.length - 1
-  );
-
-  return bytes.toFixed(dp) + ' ' + units[u];
-}