Migrate `GroupList` to tailwind

src/sidebar/components/GroupList/GroupList.js

+import classnames from 'classnames';
 import { useMemo, useState } from 'preact/hooks';
 
 import { serviceConfig } from '../../config/service-config';
@@ -86,9 +87,21 @@ function GroupList({ settings }) {
     // and pass an empty string.
     const altName = orgName(focusedGroup) ? orgName(focusedGroup) : '';
     label = (
-      <span className="GroupList__menu-label">
+      <span
+        className={classnames(
+          // Don't allow this label to shrink (wrap to next line)
+          'shrink-0 flex items-center gap-x-1 text-lg text-color-text font-bold'
+        )}
+      >
         {icon && (
-          <img className="GroupList__menu-icon" src={icon} alt={altName} />
+          <img
+            className={classnames(
+              // Tiny adjustment to make H logo align better with group name
+              'relative top-[1px] w-4 h-4'
+            )}
+            src={icon}
+            alt={altName}
+          />
         )}
         {focusedGroup.name}
       </span>
@@ -114,7 +127,7 @@ function GroupList({ settings }) {
   return (
     <Menu
       align="left"
-      contentClass="GroupList__content"
+      contentClass="min-w-[250px]"
       label={label}
       onOpenChanged={() => setExpandedGroup(null)}
       title={menuTitle}

src/styles/sidebar/components/GroupList.scss

-@use '../../variables' as var;
-@use '../../mixins/utils';
-
-.GroupList__content {
-  min-width: 250px;
-}
-
-.GroupList__menu-label {
-  @include utils.font--large;
-  align-items: center;
-  color: var.$color-text;
-  display: flex;
-
-  // Prevent label from wrapping if top bar is too narrow to fit all of its
-  // items.
-  flex-shrink: 0;
-  font-weight: bold;
-}
-
-.GroupList__menu-icon {
-  @include utils.icon--medium;
-  margin-right: 4px;
-
-  // A minor adjustment to make the default icon (the Hypothesis logo) align
-  // better with the text.
-  position: relative;
-  top: 1px;
-}

src/styles/sidebar/components/_index.scss

@@ -10,7 +10,6 @@
 // UI (Preact) Components
 // ----------
 @use './FilterSelect';
-@use './GroupList';
 @use './StyledText';
 
 // TODO: Evaluate all classes below after components have been converted to