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 -->

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

packages/frontend/core/src/blocksuite/ai/extensions/ai-slash-menu.ts

@@ -19,7 +19,7 @@ import {
 } from '../widgets/ai-panel/ai-panel';
 
 export function AiSlashMenuConfigExtension() {
-  const AIItems = pageAIGroups.map(group => group.items).flat();
+  const AIItems = pageAIGroups.flatMap(group => group.items);
 
   const iconWrapper = (icon: AIItemConfig['icon']) => {
     return html`<div style="color: var(--affine-primary-color)">

packages/frontend/core/src/modules/collection/entities/collection.ts

@@ -66,7 +66,7 @@ export class Collection extends Entity<{ id: string }> {
               },
             ],
           })
-          .pipe(map(result => result.groups.map(group => group.items).flat()));
+          .pipe(map(result => result.groups.flatMap(group => group.items)));
       })
     );
   }

packages/frontend/templates/build-stickers.mjs

@@ -51,8 +51,7 @@ import stickerContent${id} from './stickers/${category}/Content/${sticker}';`,
 }
 
 const importStatements = Object.values(data)
-  .map(v => Object.values(v).map(v => v.importStatement))
-  .flat()
+  .flatMap(v => Object.values(v).map(v => v.importStatement))
   .join('\n');
 
 const templates = `const templates = {