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/widgets/keyboard-toolbar/src/view.ts

@@ -0,0 +1,28 @@
+import {
+  type ViewExtensionContext,
+  ViewExtensionProvider,
+} from '@blocksuite/affine-ext-loader';
+import { IS_MOBILE } from '@blocksuite/global/env';
+
+import { effects } from './effects';
+import { keyboardToolbarWidget } from './widget';
+
+export class KeyboardToolbarViewExtension extends ViewExtensionProvider {
+  override name = 'affine-keyboard-toolbar-widget';
+
+  override effect() {
+    super.effect();
+    effects();
+  }
+
+  override setup(context: ViewExtensionContext) {
+    super.setup(context);
+    if (
+      context.scope === 'mobile-page' ||
+      // Legacy mobile page
+      (context.scope === 'page' && IS_MOBILE)
+    ) {
+      context.register(keyboardToolbarWidget);
+    }
+  }
+}