feat(editor): edgeless zoom toolbar widget extension (#12037)

Closes: BS-3363

blocksuite/affine/widgets/edgeless-zoom-toolbar/src/view.ts

@@ -0,0 +1,23 @@
+import {
+  type ViewExtensionContext,
+  ViewExtensionProvider,
+} from '@blocksuite/affine-ext-loader';
+
+import { effects } from './effects';
+import { edgelessZoomToolbarWidget } from './index';
+
+export class EdgelessZoomToolbarViewExtension extends ViewExtensionProvider {
+  override name = 'affine-edgeless-zoom-toolbar-widget';
+
+  override effect() {
+    super.effect();
+    effects();
+  }
+
+  override setup(context: ViewExtensionContext) {
+    super.setup(context);
+    if (this.isEdgeless(context.scope)) {
+      context.register(edgelessZoomToolbarWidget);
+    }
+  }
+}