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

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[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 -->

packages/backend/server/src/plugins/copilot/providers/gemini/gemini.ts

@@ -255,8 +255,7 @@ export abstract class GeminiProvider<T> extends CopilotProvider<T> {
       );
 
       return embeddings
-        .map(e => (e.status === 'fulfilled' ? e.value.embeddings : null))
-        .flat()
+        .flatMap(e => (e.status === 'fulfilled' ? e.value.embeddings : null))
         .filter((v): v is number[] => !!v && Array.isArray(v));
     } catch (e: any) {
       metrics.ai