feat(editor): viewport overlay widget extension (#12035)

Closes: BS-3360

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

- **New Features**
  - Introduced a new viewport overlay widget, making it available as part of the workspace and enabling its integration into supported pages.

- **Refactor**
  - Updated internal imports and exports to utilize the new viewport overlay widget package.
  - Streamlined widget registration and extension mechanisms for improved modularity.

- **Chores**
  - Added configuration and project references to support the new viewport overlay widget package in the build system.
<!-- end of auto-generated comment: release notes by coderabbit.ai -->

packages/frontend/core/src/blocksuite/ai/widgets/ai-panel/ai-panel.ts

@@ -1,7 +1,3 @@
-import {
-  AFFINE_VIEWPORT_OVERLAY_WIDGET,
-  type AffineViewportOverlayWidget,
-} from '@blocksuite/affine/blocks/root';
 import { ColorScheme } from '@blocksuite/affine/model';
 import {
   DocModeProvider,
@@ -19,6 +15,10 @@ import { WidgetComponent, WidgetViewExtension } from '@blocksuite/affine/std';
 import { GfxControllerIdentifier } from '@blocksuite/affine/std/gfx';
 import { RANGE_SYNC_EXCLUDE_ATTR } from '@blocksuite/affine/std/inline';
 import type { BaseSelection } from '@blocksuite/affine/store';
+import {
+  AFFINE_VIEWPORT_OVERLAY_WIDGET,
+  type AffineViewportOverlayWidget,
+} from '@blocksuite/affine/widgets/viewport-overlay';
 import {
   autoPlacement,
   autoUpdate,