feat(core): adjust explorer section style, persist collapsable state (#7679)

close AF-1124,AF-1129,AF-1134,AF-1144

packages/frontend/core/src/modules/index.ts

@@ -5,6 +5,7 @@ import { configureCloudModule } from './cloud';
 import { configureCollectionModule } from './collection';
 import { configureDocLinksModule } from './doc-link';
 import { configureDocsSearchModule } from './docs-search';
+import { configureExplorerModule } from './explorer';
 import { configureFavoriteModule } from './favorite';
 import { configureFindInPageModule } from './find-in-page';
 import { configureNavigationModule } from './navigation';
@@ -35,4 +36,5 @@ export function configureCommonModules(framework: Framework) {
   configureDocLinksModule(framework);
   configureOrganizeModule(framework);
   configureFavoriteModule(framework);
+  configureExplorerModule(framework);
 }