Groupchats feature branch (#10181)

Co-authored-by: DS Boyce <260543580+ds-boyce@users.noreply.github.com>
Co-authored-by: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

src/Navigation.tsx

@@ -78,6 +78,7 @@ import HashtagScreen from '#/screens/Hashtag'
 import {LogScreen} from '#/screens/Log'
 import {MessagesScreen} from '#/screens/Messages/ChatList'
 import {MessagesConversationScreen} from '#/screens/Messages/Conversation'
+import {MessagesConversationSettingsScreen} from '#/screens/Messages/ConversationSettings'
 import {MessagesInboxScreen} from '#/screens/Messages/Inbox'
 import {MessagesSettingsScreen} from '#/screens/Messages/Settings'
 import {ModerationScreen} from '#/screens/Moderation'
@@ -568,6 +569,11 @@ function commonScreens(Stack: typeof Flat, unreadCountLabel?: string) {
         getComponent={() => MessagesConversationScreen}
         options={{title: title(msg`Chat`), requireAuth: true}}
       />
+      <Stack.Screen
+        name="MessagesConversationSettings"
+        getComponent={() => MessagesConversationSettingsScreen}
+        options={{title: title(msg`Group chat settings`), requireAuth: true}}
+      />
       <Stack.Screen
         name="MessagesSettings"
         getComponent={() => MessagesSettingsScreen}