fix: connector label editing (#12282)

Fixes [BS-3373](https://linear.app/affine-design/issue/BS-3373/connector%E7%9A%84%E5%8F%8C%E5%87%BB%E6%B7%BB%E5%8A%A0note%E8%A1%8C%E4%B8%BA%E5%8F%97%E5%88%B0%E4%BA%86%E8%A6%86%E7%9B%96%E8%8C%83%E5%9B%B4%E7%9A%84%E5%BD%B1%E5%93%8D)

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

- **New Features**
  - Connector label elements now include identity and creator metadata.

- **Bug Fixes**
  - Improved hit-testing for pointer interactions, resulting in more accurate detection of hovered elements.

- **Refactor**
  - Enhanced internal comparison logic for elements, improving sorting and ordering consistency.
  - Strengthened type definitions for search filters, improving result accuracy and clarity.

- **Tests**
  - Added end-to-end tests to verify correct label entry and retrieval for multiple connectors.
  - Introduced utility functions to fetch connector labels and improved connector creation in test actions.
<!-- end of auto-generated comment: release notes by coderabbit.ai -->

blocksuite/framework/std/src/gfx/model/surface/local-element-model.ts

@@ -13,7 +13,7 @@ import { mutex } from 'lib0';
 
 import type { EditorHost } from '../../../view/index.js';
 import type { GfxCompatibleInterface, PointTestOptions } from '../base.js';
-import type { GfxGroupModel } from '../model.js';
+import type { GfxGroupModel, GfxModel } from '../model.js';
 import type { SurfaceBlockModel } from './surface-model.js';
 
 export function prop<V, T extends GfxLocalElementModel>() {
@@ -61,6 +61,8 @@ export abstract class GfxLocalElementModel implements GfxCompatibleInterface {
 
   abstract readonly type: string;
 
+  creator: GfxModel | null = null;
+
   get deserializedXYWH() {
     if (!this._local.has('deserializedXYWH')) {
       const xywh = this.xywh;