Establish `components` CSS layer for sidebar

src/styles/sidebar/components/_index.scss

+@use 'tailwindcss/components';
+
+// Shared styles
+// -----------------
+@use '@hypothesis/frontend-shared/styles';
+
+// Extensions and overrides to patterns from `frontend-shared`
+@use '../../frontend-shared';
+
+// Local patterns
+@use '../../patterns';
+
+// Components
+// ----------
+@use './AnnotationPublishControl';
+@use './AnnotationShareControl';
+@use './AutocompleteList';
+@use './Excerpt';
+@use './FilterSelect';
+@use './FilterStatus';
+@use './GroupList';
+@use './GroupListItem';
+@use './HypothesisApp';
+@use './LaunchErrorPanel';
+@use './LoggedOutMessage';
+@use './MarkdownEditor';
+@use './MarkdownView';
+@use './Menu';
+@use './MenuItem';
+@use './MenuSection';
+@use './ModerationBanner';
+@use './NotebookView';
+@use './NotebookResultCount';
+@use './PaginationNavigation';
+@use './SelectionTabs';
+@use './SearchInput';
+@use './ShareLinks';
+@use './TagEditor';
+@use './TagList';
+@use './Thread';
+@use './ThreadCard';
+@use './ThreadList';
+@use './ToastMessages';
+@use './TopBar';
+@use './VersionInfo';

src/styles/sidebar/sidebar.scss

 @use './base';
-
-// Shared styles
-// -----------------
-@use '@hypothesis/frontend-shared/styles';
-
-// Extensions and overrides to patterns from `frontend-shared`
-@use '../frontend-shared';
-
-// Local patterns
-@use '../patterns';
-
-// Components
-// ----------
-@use './components/AnnotationPublishControl';
-@use './components/AnnotationShareControl';
-@use './components/AutocompleteList';
-@use './components/Excerpt';
-@use './components/FilterSelect';
-@use './components/FilterStatus';
-@use './components/GroupList';
-@use './components/GroupListItem';
-@use './components/HypothesisApp';
-@use './components/LaunchErrorPanel';
-@use './components/LoggedOutMessage';
-@use './components/MarkdownEditor';
-@use './components/MarkdownView';
-@use './components/Menu';
-@use './components/MenuItem';
-@use './components/MenuSection';
-@use './components/ModerationBanner';
-@use './components/NotebookView';
-@use './components/NotebookResultCount';
-@use './components/PaginationNavigation';
-@use './components/SelectionTabs';
-@use './components/SearchInput';
-@use './components/ShareLinks';
-@use './components/TagEditor';
-@use './components/TagList';
-@use './components/Thread';
-@use './components/ThreadCard';
-@use './components/ThreadList';
-@use './components/ToastMessages';
-@use './components/TopBar';
-@use './components/VersionInfo';
-
+@use './components';
 @use './utilities';