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/analytics/metrics/types.ts

@@ -563,6 +563,9 @@ export type Events = {
       | 'ChatsList'
       | 'SendViaChatDialog'
   }
+  'groupchat:create': {
+    logContext: 'NewChatDialog'
+  }
   'starterPack:addUser': {
     starterPack?: string
   }