Improved list and feed errors (#1798)

* Fix error-state rendering of ProfileList

* Unsave/unpin lists on delete

* Improve handling of failing feedgens

* Only show 'remove' btn on feed DNE

src/view/com/util/Views.d.ts

@@ -1 +1,8 @@
-export {FlatList, ScrollView, View as CenteredView} from 'react-native'
+import React from 'react'
+import {ViewProps} from 'react-native'
+export {FlatList, ScrollView} from 'react-native'
+export function CenteredView({
+  style,
+  sideBorders,
+  ...props
+}: React.PropsWithChildren<ViewProps & {sideBorders?: boolean}>)