[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/util/forms/DropdownButton.tsx

@@ -50,6 +50,8 @@ interface DropdownButtonProps {
   openToRight?: boolean
   rightOffset?: number
   bottomOffset?: number
+  accessibilityLabel?: string
+  accessibilityHint?: string
 }
 
 export function DropdownButton({
@@ -63,6 +65,7 @@ export function DropdownButton({
   openToRight = false,
   rightOffset = 0,
   bottomOffset = 0,
+  accessibilityLabel,
 }: PropsWithChildren<DropdownButtonProps>) {
   const ref1 = useRef<TouchableOpacity>(null)
   const ref2 = useRef<View>(null)
@@ -128,8 +131,8 @@ export function DropdownButton({
         hitSlop={HITSLOP}
         ref={ref1}
         accessibilityRole="button"
-        accessibilityLabel={`Opens ${numItems} options`}
-        accessibilityHint={`Opens ${numItems} options`}>
+        accessibilityLabel={accessibilityLabel || `Opens ${numItems} options`}
+        accessibilityHint="">
         {children}
       </TouchableOpacity>
     )
@@ -246,7 +249,9 @@ export function PostDropdownBtn({
       testID={testID}
       style={style}
       items={dropdownItems}
-      menuWidth={isWeb ? 220 : 200}>
+      menuWidth={isWeb ? 220 : 200}
+      accessibilityLabel="Additional post actions"
+      accessibilityHint="">
       {children}
     </DropdownButton>
   )
@@ -335,6 +340,7 @@ const DropdownItems = ({
                 key={index}
                 style={[styles.menuItem]}
                 onPress={() => onPressItem(index)}
+                accessibilityRole="button"
                 accessibilityLabel={item.label}
                 accessibilityHint={`Option ${index + 1} of ${numItems}`}>
                 {item.icon && (