Prefilter the mergefeed to ensure a better mix of following and custom feeds (#1498)

* Prefilter the mergefeed to ensure a better mix of following and custom feeds

* Test suite improvements & tests for the mergefeed (#1499)

* Disable invite codes test for now

* Update test sim to latest iphone

* Introduce TestCtrls driver

* Add mergefeed tests

src/view/com/modals/ProfilePreview.tsx

@@ -35,7 +35,7 @@ export const Component = observer(function ProfilePreviewImpl({
   }, [model, screen])
 
   return (
-    <View style={[pal.view, s.flex1]}>
+    <View testID="profilePreview" style={[pal.view, s.flex1]}>
       <View
         style={[
           styles.headerWrapper,