feat(core): adjust ai help island style and behavior, add animation (#7310)

- Move right-sidebar activeTab state into `RightSidebarService`
- Remove `styled` usage and adjust the UI
- Fix the issue that ai-button clicking not work when sidebar opened
- Add an animation if AI-Chat panel hasn't been opened.

![CleanShot 2024-06-24 at 18.10.27.gif](https://graphite-user-uploaded-assets-prod.s3.amazonaws.com/LakojjjzZNf6ogjOVwKE/14c86fbc-ad4c-44bf-93fe-ca3450db908b.gif)

packages/frontend/component/src/styles/styled.tsx

@@ -1,3 +1,8 @@
 import styled from '@emotion/styled';
 
-export { styled };
+export {
+  /**
+   * @deprecated  `@emotion/styled` is planned to be removed in the future. Do not use for new components.
+   **/
+  styled,
+};