feat(editor): add frame title and mobile toolbar widget extension (#11996)

Closes: BS-3223
Closes: BS-3224

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

- **New Features**
  - Introduced new view extensions for frame title and keyboard toolbar widgets with conditional registration based on context and environment.
  - Enhanced widget integration by adding explicit exports for view components.

- **Chores**
  - Updated export paths and package dependencies to improve modularity and compatibility.
  - Removed deprecated widget dependencies and related imports from core packages.
<!-- end of auto-generated comment: release notes by coderabbit.ai -->

blocksuite/affine/blocks/root/src/page/page-root-spec.ts

@@ -1,6 +1,4 @@
 import { ViewportElementExtension } from '@blocksuite/affine-shared/services';
-import { keyboardToolbarWidget } from '@blocksuite/affine-widget-keyboard-toolbar';
-import { IS_MOBILE } from '@blocksuite/global/env';
 import { BlockViewExtension, WidgetViewExtension } from '@blocksuite/std';
 import type { ExtensionType } from '@blocksuite/store';
 import { literal, unsafeStatic } from 'lit/static-html.js';
@@ -26,7 +24,6 @@ const PageCommonExtension: ExtensionType[] = [
 export const PageRootBlockSpec: ExtensionType[] = [
   ...PageCommonExtension,
   BlockViewExtension('affine:page', literal`affine-page-root`),
-  IS_MOBILE ? [keyboardToolbarWidget] : [],
   PageClipboard,
 ].flat();