fix(editor): can not create surface block comment (#13115)

<!-- This is an auto-generated comment: release notes by coderabbit.ai
-->

## Summary by CodeRabbit

* **Bug Fixes**
* Improved comment handling to ensure elements from all selections are
considered, regardless of surface ID.
* Enhanced preview generation for comments to include all relevant
selections without surface-based filtering.

<!-- end of auto-generated comment: release notes by coderabbit.ai -->

blocksuite/affine/shared/src/services/comment-service/block-element-comment-manager.ts

@@ -123,8 +123,7 @@ export class BlockElementCommentManager extends LifeCycleWatcher {
     const gfx = this.std.get(GfxControllerIdentifier);
     const elementsFromSurfaceSelection = selections
       .filter(s => s instanceof SurfaceSelection)
-      .flatMap(({ blockId, elements }) => {
-        if (blockId !== gfx.surface?.id) return [];
+      .flatMap(({ elements }) => {
         return elements
           .map(id => gfx.getElementById<GfxModel>(id))
           .filter(m => m !== null);