refactor(editor): cleanup dead code (#12072)

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

- **Refactor**
  - Simplified and removed several internal AI block extension files and utility functions, streamlining the codebase and reducing unused features.
  - Updated logic to access editor modes and controllers directly, removing reliance on DOM queries and certain abstractions.
  - Reduced and restructured effect type declarations for improved clarity.

- **Bug Fixes**
  - Improved type safety in the editor component by explicitly typing queried elements.

- **Chores**
  - Removed obsolete exports and internal functions with no impact on user-facing functionality.
<!-- end of auto-generated comment: release notes by coderabbit.ai -->

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

@@ -3,7 +3,10 @@ import type { DefaultOpenProperty } from '@affine/core/components/doc-properties
 import type { DocTitle } from '@blocksuite/affine/fragments/doc-title';
 import type { DocMode, ReferenceParams } from '@blocksuite/affine/model';
 import { HighlightSelection } from '@blocksuite/affine/shared/selection';
-import { FeatureFlagService as BSFeatureFlagService } from '@blocksuite/affine/shared/services';
+import {
+  DocModeProvider,
+  FeatureFlagService as BSFeatureFlagService,
+} from '@blocksuite/affine/shared/services';
 import { GfxControllerIdentifier } from '@blocksuite/affine/std/gfx';
 import type { InlineEditor } from '@blocksuite/std/inline';
 import { effect } from '@preact/signals-core';
@@ -293,19 +296,18 @@ export class Editor extends Entity {
     unsubs.push(subscription.unsubscribe.bind(subscription));
 
     // ----- Presenting -----
-    const edgelessPage = editorContainer.host?.querySelector(
-      'affine-edgeless-root'
-    );
-    if (!edgelessPage) {
+    const std = editorContainer.host?.std;
+    const editorMode = std?.get(DocModeProvider)?.getEditorMode();
+    if (!editorMode || editorMode !== 'edgeless' || !gfx) {
       this.isPresenting$.next(false);
     } else {
       this.isPresenting$.next(
-        edgelessPage.gfx.tool.currentToolName$.peek() === 'frameNavigator'
+        gfx.tool.currentToolName$.peek() === 'frameNavigator'
       );
 
       const disposable = effect(() => {
         this.isPresenting$.next(
-          edgelessPage.gfx.tool.currentToolName$.value === 'frameNavigator'
+          gfx.tool.currentToolName$.value === 'frameNavigator'
         );
       });
       unsubs.push(disposable);