Threads v2 cleanup (#8902)

* Delete root PostThread component

* Remove PostThreadItem, migrate DebugMod to use new components

* Remove other unused components

* Move PostThreadFollowBtn to new home

* Move PostThreadComposePrompt to new home

* Remove gate

* Keep naming in DebugMod

* rm v1 prefs

---------

Co-authored-by: Samuel Newman <mozzius@protonmail.com>

src/view/screens/PostThread.tsx

@@ -5,17 +5,14 @@ import {
   type CommonNavigatorParams,
   type NativeStackScreenProps,
 } from '#/lib/routes/types'
-import {useGate} from '#/lib/statsig/statsig'
 import {makeRecordUri} from '#/lib/strings/url-helpers'
 import {useSetMinimalShellMode} from '#/state/shell'
-import {PostThread as PostThreadComponent} from '#/view/com/post-thread/PostThread'
 import {PostThread} from '#/screens/PostThread'
 import * as Layout from '#/components/Layout'
 
 type Props = NativeStackScreenProps<CommonNavigatorParams, 'PostThread'>
 export function PostThreadScreen({route}: Props) {
   const setMinimalShellMode = useSetMinimalShellMode()
-  const gate = useGate()
 
   const {name, rkey} = route.params
   const uri = makeRecordUri(name, 'app.bsky.feed.post', rkey)
@@ -28,11 +25,7 @@ export function PostThreadScreen({route}: Props) {
 
   return (
     <Layout.Screen testID="postThreadScreen">
-      {gate('post_threads_v2_unspecced') || __DEV__ ? (
-        <PostThread uri={uri} />
-      ) : (
-        <PostThreadComponent uri={uri} />
-      )}
+      <PostThread uri={uri} />
     </Layout.Screen>
   )
 }