Convert AnnotationShareControl to TW and use shared Card component

Previously, this component was _styled_ as a "panel", via SASS mixins,
but did not have any behavioral "panel-ness."

For now, use the shared Card (presentational) component for this
 component, and remove unused SASS and mixins.

src/sidebar/components/Annotation/AnnotationShareControl.js

 import {
+  Card,
   Icon,
   IconButton,
   TextInput,
   TextInputWithButton,
   useElementShouldClose,
 } from '@hypothesis/frontend-shared';
+import classnames from 'classnames';
 import { useEffect, useRef, useState } from 'preact/hooks';
 
 import { isShareableURI } from '../../helpers/annotation-sharing';
@@ -37,6 +39,23 @@ function selectionOverflowsInputElement() {
   return isIOS();
 }
 
+/**
+ *
+ * @param {object} props
+ *   @param {string} [props.classes] - Optional additional CSS classes
+ */
+function MenuArrowDown({ classes }) {
+  return (
+    <Icon
+      name="pointer"
+      classes={classnames(
+        'absolute inline z-2 text-grey-3 fill-white rotate-180',
+        classes
+      )}
+    />
+  );
+}
+
 /**
  * "Popup"-style component for sharing a single annotation.
  *
@@ -123,7 +142,7 @@ function AnnotationShareControl({
   );
 
   return (
-    <div className="AnnotationShareControl" ref={shareRef}>
+    <div className="relative" ref={shareRef}>
       <IconButton
         icon="share"
         title="Share"
@@ -131,14 +150,31 @@ function AnnotationShareControl({
         expanded={isOpen}
       />
       {isOpen && (
-        <div className="annotation-share-panel">
-          <div className="annotation-share-panel__header">
-            <div className="annotation-share-panel__title">
+        <Card
+          classes={classnames(
+            // Prefer width 96 (24rem) but ensure that component isn't wider
+            // than 85vw
+            'w-96 max-w-[85vw]',
+            // Position this Card above its IconButton. Account for larger
+            // IconButtons in touch interfaces
+            'absolute bottom-8 right-1 touch:bottom-touch-minimum',
+            'space-y-2 p-2',
+            // Cards do not have a border in the clean theme. Turn it back on.
+            'theme-clean:border'
+          )}
+        >
+          <div className="flex items-center pb-2 border-b">
+            <h2 className="text-brand text-lg font-medium">
               Share this annotation
+            </h2>
           </div>
-          </div>
-          <div className="annotation-share-panel__content">
-            <div className="hyp-u-layout-row annotation-share-panel__inputs">
+          <div
+            className={classnames(
+              // Slightly larger font size for touch devices to correspond with
+              // larger button and input sizes
+              'flex w-full text-sm touch:text-base'
+            )}
+          >
             <TextInputWithButton>
               <TextInput
                 aria-label="Use this URL to share this annotation"
@@ -155,21 +191,20 @@ function AnnotationShareControl({
               />
             </TextInputWithButton>
           </div>
+          <div className="text-base font-normal" data-testid="share-details">
             {inContextAvailable ? (
-              <div className="annotation-share-panel__details">
-                {annotationSharingInfo}
-              </div>
+              <>{annotationSharingInfo}</>
             ) : (
-              <div className="annotation-share-panel__details">
+              <>
                 This annotation cannot be shared in its original context because
                 it was made on a document that is not available on the web. This
                 link shares the annotation by itself.
-              </div>
+              </>
             )}
-            {showShareLinks && <ShareLinks shareURI={shareUri} />}
-          </div>
-          <Icon name="pointer" classes="annotation-share-panel__arrow" />
           </div>
+          {showShareLinks && <ShareLinks shareURI={shareUri} />}
+          <MenuArrowDown classes="bottom-[-12px] right-1 touch:right-[9px]" />
+        </Card>
       )}
     </div>
   );

src/sidebar/components/Annotation/test/AnnotationShareControl-test.js

@@ -106,7 +106,7 @@ describe('AnnotationShareControl', () => {
     const wrapper = createComponent();
 
     // Component is not `open` initially
-    assert.isFalse(wrapper.find('.annotation-share-panel').exists());
+    assert.isFalse(wrapper.find('Card').exists());
   });
 
   it('toggles the share control element when the button is clicked', () => {
@@ -118,7 +118,7 @@ describe('AnnotationShareControl', () => {
     });
     wrapper.update();
 
-    assert.isTrue(wrapper.find('.annotation-share-panel').exists());
+    assert.isTrue(wrapper.find('Card').exists());
   });
 
   it('renders the share URI in a readonly input field', () => {
@@ -194,7 +194,7 @@ describe('AnnotationShareControl', () => {
       const wrapper = createComponent({ isPrivate: testcase.isPrivate });
       openElement(wrapper);
 
-      const permissionsEl = wrapper.find('.annotation-share-panel__details');
+      const permissionsEl = wrapper.find('[data-testid="share-details"]');
       assert.equal(permissionsEl.text(), testcase.expected);
     });
   });
@@ -204,7 +204,7 @@ describe('AnnotationShareControl', () => {
     const wrapper = createComponent();
     openElement(wrapper);
 
-    const detailsEl = wrapper.find('.annotation-share-panel__details');
+    const detailsEl = wrapper.find('[data-testid="share-details"]');
     assert.include(
       detailsEl.text(),
       'This annotation cannot be shared in its original context'

src/styles/mixins/molecules.scss

@@ -105,22 +105,6 @@
   }
 }
 
-/**
- * `panel` with tighter margins and padding, for use in more confined spaces
- */
-@mixin panel--compact {
-  @include panel($rhythm: var.$layout-space--xsmall);
-  width: 24em;
-  // Keep panel constrained within annotation card boundaries and not cut off
-  // on left side when sidebar is extremely narrow
-  max-width: 85vw;
-  padding: var.$layout-space--small;
-
-  &__header {
-    padding-bottom: var.$layout-space--xsmall;
-  }
-}
-
 /**
  * A full-width banner with optional "type" and styled icon at left
  */

src/styles/sidebar/components/AnnotationShareControl.scss

-@use '../../mixins/buttons';
-@use '../../mixins/forms';
-@use '../../mixins/layout';
-@use '../../mixins/molecules';
-@use '../../mixins/utils';
-@use '../../variables' as var;
-
-.AnnotationShareControl {
-  // Allow pointer arrow to be positioned absolutely relative to this container
-  position: relative;
-}
-
-// A compact panel that appears/disappears by tapping the "share" icon on a
-// single annotation.
-.annotation-share-panel {
-  @include molecules.panel--compact;
-  // Position panel to align with share-annotation icon and alignment arrow
-  position: absolute;
-  right: 5px;
-  bottom: 32px;
-
-  @media (pointer: coarse) {
-    // Adjust arrow/panel positioning to account for larger icon target
-    right: 13px;
-    bottom: 40px;
-  }
-
-  // Override the pointer cursor that applies to the entire card
-  cursor: default;
-
-  // Hide the bottom border on the panel's header if displaying
-  // input (with sharing link) directly below
-  &__header {
-    border-bottom: none;
-  }
-
-  &__inputs {
-    @include utils.font--small;
-    width: 100%;
-  }
-
-  &__details {
-    @include utils.font--small;
-    padding: var.$layout-space--xsmall 0;
-  }
-
-  // Position the pointer icon absolutely and flip it to make it point at the
-  // share icon
-  &__arrow {
-    display: inline;
-    @include molecules.menu-arrow($direction: 'down');
-    right: 0px;
-    bottom: -12px;
-  }
-}

src/styles/sidebar/components/_index.scss

@@ -12,7 +12,6 @@
 
 // UI (Preact) Components
 // ----------
-@use './AnnotationShareControl';
 @use './AutocompleteList';
 @use './FilterSelect';
 @use './FilterStatus';