Thread muting [APP-29] (#500)

* Implement thread muting

* Apply filtering on background fetched notifs

* Implement thread-muting tests

src/view/com/util/Selector.tsx

@@ -94,7 +94,10 @@ export function Selector({
       {items.map((item, i) => {
         const selected = i === selectedIndex
         return (
-          <Pressable key={item} onPress={() => onPressItem(i)}>
+          <Pressable
+            testID={`selector-${i}`}
+            key={item}
+            onPress={() => onPressItem(i)}>
             <View style={styles.item} ref={itemRefs[i]}>
               <Text
                 style={