Add "Who can reply" controls [WIP] (#1954)

* Add threadgating

* UI improvements

* More ui work

* Remove comment

* Tweak colors

* Add missing keys

* Tweak sizing

* Only show composer option on non-reply

* Flex wrap fix

* Move the threadgate control to the top of the composer

src/view/com/composer/Composer.tsx

@@ -35,6 +35,7 @@ import {shortenLinks} from 'lib/strings/rich-text-manip'
 import {toShortUrl} from 'lib/strings/url-helpers'
 import {SelectPhotoBtn} from './photos/SelectPhotoBtn'
 import {OpenCameraBtn} from './photos/OpenCameraBtn'
+import {ThreadgateBtn} from './threadgate/ThreadgateBtn'
 import {usePalette} from 'lib/hooks/usePalette'
 import {useWebMediaQueries} from 'lib/hooks/useWebMediaQueries'
 import {useExternalLinkFetch} from './useExternalLinkFetch'
@@ -61,6 +62,7 @@ import {useProfileQuery} from '#/state/queries/profile'
 import {useComposerControls} from '#/state/shell/composer'
 import {until} from '#/lib/async/until'
 import {emitPostCreated} from '#/state/events'
+import {ThreadgateSetting} from '#/state/queries/threadgate'
 
 type Props = ComposerOpts
 export const ComposePost = observer(function ComposePost({
@@ -105,6 +107,7 @@ export const ComposePost = observer(function ComposePost({
   )
   const {extLink, setExtLink} = useExternalLinkFetch({setQuote})
   const [labels, setLabels] = useState<string[]>([])
+  const [threadgate, setThreadgate] = useState<ThreadgateSetting[]>([])
   const [suggestedLinks, setSuggestedLinks] = useState<Set<string>>(new Set())
   const gallery = useMemo(() => new GalleryModel(), [])
   const onClose = useCallback(() => {
@@ -220,6 +223,7 @@ export const ComposePost = observer(function ComposePost({
           quote,
           extLink,
           labels,
+          threadgate,
           onStateChange: setProcessingState,
           langs: toPostLanguages(langPrefs.postLanguage),
         })
@@ -296,6 +300,12 @@ export const ComposePost = observer(function ComposePost({
                 onChange={setLabels}
                 hasMedia={hasMedia}
               />
+              {replyTo ? null : (
+                <ThreadgateBtn
+                  threadgate={threadgate}
+                  onChange={setThreadgate}
+                />
+              )}
               {canPost ? (
                 <TouchableOpacity
                   testID="composerPublishBtn"
@@ -458,9 +468,11 @@ const styles = StyleSheet.create({
   topbar: {
     flexDirection: 'row',
     alignItems: 'center',
+    paddingTop: 6,
     paddingBottom: 4,
     paddingHorizontal: 20,
     height: 55,
+    gap: 4,
   },
   topbarDesktop: {
     paddingTop: 10,
@@ -470,6 +482,7 @@ const styles = StyleSheet.create({
     borderRadius: 20,
     paddingHorizontal: 20,
     paddingVertical: 6,
+    marginLeft: 12,
   },
   errorLine: {
     flexDirection: 'row',