[APP-724] Collection of accessibility fixes (#949)

* Fix: include alt text on the web lightbox image

* a11y: Dont read the 'ALT' label

* a11y: remove a wrapper behavior from posts

This appears to have been introduced with the goal of creating meta
actions on posts, but the behavior seems counter-productive. The
accessibility inspector was unable to access individual items within
the post and therefore most content was simply skipped.

There may be a way to support the post actions without losing the
ability to access the inner elements but I couldnt find it. -prf

* a11y: apply alt tags to image wrappers so they get read

* a11y: set Link accessibilityLabel to the title if none set

* a11y: skip the SANDBOX watermark

* a11y: improve post meta to not read UI and give a useful date

* ally: improve post controls

* a11y: add labels to lightbox images on mobile

* fix types

src/view/com/post/Post.tsx

@@ -1,6 +1,5 @@
-import React, {useCallback, useEffect, useMemo, useState} from 'react'
+import React, {useEffect, useState} from 'react'
 import {
-  AccessibilityActionEvent,
   ActivityIndicator,
   Linking,
   StyleProp,
@@ -200,47 +199,11 @@ const PostLoaded = observer(
       )
     }, [item, setDeleted, store])
 
-    const accessibilityActions = useMemo(
-      () => [
-        {
-          name: 'reply',
-          label: 'Reply',
-        },
-        {
-          name: 'repost',
-          label: item.post.viewer?.repost ? 'Undo repost' : 'Repost',
-        },
-        {name: 'like', label: item.post.viewer?.like ? 'Unlike' : 'Like'},
-      ],
-      [item.post.viewer?.like, item.post.viewer?.repost],
-    )
-
-    const onAccessibilityAction = useCallback(
-      (event: AccessibilityActionEvent) => {
-        switch (event.nativeEvent.actionName) {
-          case 'like':
-            onPressToggleLike()
-            break
-          case 'reply':
-            onPressReply()
-            break
-          case 'repost':
-            onPressToggleRepost()
-            break
-          default:
-            break
-        }
-      },
-      [onPressReply, onPressToggleLike, onPressToggleRepost],
-    )
-
     return (
       <PostHider
         href={itemHref}
         style={[styles.outer, pal.view, pal.border, style]}
-        moderation={item.moderation.list}
-        accessibilityActions={accessibilityActions}
-        onAccessibilityAction={onAccessibilityAction}>
+        moderation={item.moderation.list}>
         {showReplyLine && <View style={styles.replyLine} />}
         <View style={styles.layout}>
           <View style={styles.layoutAvi}>