Migrate `FilterSelect` to tailwind

src/sidebar/components/FilterSelect.js

 import { Icon } from '@hypothesis/frontend-shared';
+import classnames from 'classnames';
 
 import Menu from './Menu';
 import MenuItem from './MenuItem';
@@ -35,14 +36,28 @@ function FilterSelect({
   const selected = selectedOption ?? defaultOption;
 
   const menuLabel = (
-    <span className="FilterSelect__menu-label">
-      {icon && <Icon name={icon} classes="text-xl hyp-u-margin--right--3" />}
+    <span
+      className={classnames(
+        // Don't allow the label text to wrap
+        'shrink-0 flex items-center gap-x-2',
+        'text-color-text font-bold text-lg'
+      )}
+    >
+      {icon && <Icon name={icon} classes="w-4 h-4" />}
       {selected.display}
     </span>
   );
 
   return (
-    <Menu label={menuLabel} title={title} contentClass="FilterSelect__menu">
+    <Menu
+      label={menuLabel}
+      title={title}
+      contentClass={classnames(
+        // Don't let filter list get too terribly tall. On shorter screens,
+        // restrict to 70vh; set a static max-height for taller screens.
+        'max-h-[70vh] tall:max-h-[504px] overflow-y-auto'
+      )}
+    >
       {filterOptions.map(filterOption => (
         <MenuItem
           onClick={() => onSelect(filterOption)}

src/styles/sidebar/components/FilterSelect.scss

-@use '../../mixins/utils';
-@use '../../variables' as var;
-
-.FilterSelect {
-  &__menu {
-    // Prevent the list from overflowing off screen in most cases.
-    max-height: 70vh;
-    overflow-y: auto;
-
-    // Limit the length for large screens.
-    @media only screen and (min-height: 44em) {
-      max-height: 36em;
-    }
-  }
-
-  &__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;
-  }
-}

src/styles/sidebar/components/_index.scss

@@ -9,7 +9,6 @@
 
 // UI (Preact) Components
 // ----------
-@use './FilterSelect';
 @use './StyledText';
 
 // TODO: Evaluate all classes below after components have been converted to