fix(core): should not be able to commit comments when uploading images (#13108)

#### PR Dependency Tree


* **PR #13108** 👈

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

* **Bug Fixes**
* The commit button in the comment editor is now properly disabled while
attachments are uploading or when the editor is empty without
attachments, preventing accidental or premature submissions.
* **New Features**
* Attachment delete button now shows a loading state during uploads for
clearer user feedback.
* **Style**
* Updated comment editor attachment button styles for a cleaner and more
consistent appearance.
<!-- end of auto-generated comment: release notes by coderabbit.ai -->

blocksuite/affine/inlines/comment/src/inline-spec.ts

@@ -47,3 +47,7 @@ export const NullCommentInlineSpecExtension =
     match: () => false,
     renderer: () => html``,
   });
+
+// reuse the same identifier
+NullCommentInlineSpecExtension.identifier =
+  CommentInlineSpecExtension.identifier;