fix(editor): add comment entire to inner toolbar (#13304)

Close
[BS-3624](https://linear.app/affine-design/issue/BS-3624/page模式单选图片的时候希望有comment-按钮)




#### PR Dependency Tree


* **PR #13304** 👈

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**
* Added a comment button to the image and surface reference block
toolbars for easier commenting.

* **Refactor**
* Simplified array flattening operations across multiple components and
utilities by replacing `.map(...).flat()` with `.flatMap(...)`,
improving code readability and maintainability.

* **Bug Fixes**
* Improved comment creation logic to allow adding comments even when
selections exist.
<!-- end of auto-generated comment: release notes by coderabbit.ai -->

blocksuite/affine/widgets/linked-doc/src/linked-doc-popover.ts

@@ -113,11 +113,9 @@ export class LinkedDocPopover extends SignalWatcher(
   }
 
   private get _flattenActionList() {
-    return this._actionGroup
-      .map(group =>
-        group.items.map(item => ({ ...item, groupName: group.name }))
-      )
-      .flat();
+    return this._actionGroup.flatMap(group =>
+      group.items.map(item => ({ ...item, groupName: group.name }))
+    );
   }
 
   private get _query() {