React Native accessibility (#539)

* React Native accessibility

* First round of changes

* Latest update

* Checkpoint

* Wrap up

* Lint

* Remove unhelpful image hints

* Fix navigation

* Fix rebase and lint

* Mitigate an known issue with the password entry in login

* Fix composer dismiss

* Remove focus on input elements for web

* Remove i and npm

* pls work

* Remove stray declaration

* Regenerate yarn.lock

---------

Co-authored-by: Paul Frazee <pfrazee@gmail.com>

src/view/com/util/Selector.tsx

@@ -85,6 +85,8 @@ export function Selector({
     onSelect?.(index)
   }
 
+  const numItems = items.length
+
   return (
     <View
       style={[pal.view, styles.outer]}
@@ -97,7 +99,9 @@ export function Selector({
           <Pressable
             testID={`selector-${i}`}
             key={item}
-            onPress={() => onPressItem(i)}>
+            onPress={() => onPressItem(i)}
+            accessibilityLabel={`Select ${item}`}
+            accessibilityHint={`Select option ${i} of ${numItems}`}>
             <View style={styles.item} ref={itemRefs[i]}>
               <Text
                 style={