classify migrated chat group errors with matchXrpcError

The lex client throws XrpcResponseError, which is not an XRPCError
subclass, so the per-method error classes generated by @atproto/api no
longer match. Those instanceof checks compile fine but silently stop
firing, degrading every typed group failure to the generic fallback
message. Narrow against the method schema instead.

Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>

src/components/dms/dialogs/NewChatDialog.tsx

@@ -1,5 +1,4 @@
 import {useCallback} from 'react'
-import {ChatBskyGroupCreateGroup} from '@atproto/api'
 import {Trans, useLingui} from '@lingui/react/macro'
 
 import {useRequireEmailVerification} from '#/lib/hooks/useRequireEmailVerification'
@@ -88,29 +87,27 @@ export function NewChat({
       let errorMessage = l`An issue occurred starting the group chat, please try again.`
       if (isNetworkError(error)) {
         errorMessage = l`A network error occurred. Please check your internet connection.`
-      } else if (
-        error instanceof ChatBskyGroupCreateGroup.AccountSuspendedError
-      ) {
-        errorMessage = l`Suspended accounts cannot participate in a group chat.`
-      } else if (error instanceof ChatBskyGroupCreateGroup.BlockedActorError) {
-        errorMessage = l`One of the selected recipients has blocked you and cannot be messaged.`
-      } else if (
-        error instanceof
-        ChatBskyGroupCreateGroup.NewAccountCannotCreateGroupError
-      ) {
-        errorMessage = l`You cannot create a group chat yet.`
-      } else if (
-        error instanceof ChatBskyGroupCreateGroup.NotFollowedBySenderError
-      ) {
-        errorMessage = l`A selected recipient is not followed by the sender.`
-      } else if (
-        error instanceof ChatBskyGroupCreateGroup.RecipientNotFoundError
-      ) {
-        errorMessage = l`Unable to find a selected recipient.`
-      } else if (
-        error instanceof ChatBskyGroupCreateGroup.UserForbidsGroupsError
-      ) {
-        errorMessage = l`One of the selected recipients does not allow group chats.`
+      } else {
+        switch (matchXrpcError(error, chat.bsky.group.createGroup)) {
+          case 'AccountSuspended':
+            errorMessage = l`Suspended accounts cannot participate in a group chat.`
+            break
+          case 'BlockedActor':
+            errorMessage = l`One of the selected recipients has blocked you and cannot be messaged.`
+            break
+          case 'NewAccountCannotCreateGroup':
+            errorMessage = l`You cannot create a group chat yet.`
+            break
+          case 'NotFollowedBySender':
+            errorMessage = l`A selected recipient is not followed by the sender.`
+            break
+          case 'RecipientNotFound':
+            errorMessage = l`Unable to find a selected recipient.`
+            break
+          case 'UserForbidsGroups':
+            errorMessage = l`One of the selected recipients does not allow group chats.`
+            break
+        }
       }
       Toast.show(errorMessage, {
         type: 'error',

src/components/dms/dialogs/ShareViaChatDialog.tsx

@@ -1,5 +1,4 @@
 import {useCallback, useState} from 'react'
-import {ChatBskyGroupCreateGroup} from '@atproto/api'
 import {useLingui} from '@lingui/react/macro'
 
 import {isNetworkError} from '#/lib/strings/errors'
@@ -104,29 +103,27 @@ function SendViaChatDialogInner({
       let errorMessage = l`An issue occurred starting the group chat, please try again.`
       if (isNetworkError(error)) {
         errorMessage = l`A network error occurred. Please check your internet connection.`
-      } else if (
-        error instanceof ChatBskyGroupCreateGroup.AccountSuspendedError
-      ) {
-        errorMessage = l`Suspended accounts cannot participate in a group chat.`
-      } else if (error instanceof ChatBskyGroupCreateGroup.BlockedActorError) {
-        errorMessage = l`One of the selected recipients has blocked you and cannot be messaged.`
-      } else if (
-        error instanceof
-        ChatBskyGroupCreateGroup.NewAccountCannotCreateGroupError
-      ) {
-        errorMessage = l`You cannot create a group chat yet.`
-      } else if (
-        error instanceof ChatBskyGroupCreateGroup.NotFollowedBySenderError
-      ) {
-        errorMessage = l`A selected recipient is not followed by the sender.`
-      } else if (
-        error instanceof ChatBskyGroupCreateGroup.RecipientNotFoundError
-      ) {
-        errorMessage = l`Unable to find a selected recipient.`
-      } else if (
-        error instanceof ChatBskyGroupCreateGroup.UserForbidsGroupsError
-      ) {
-        errorMessage = l`One of the selected recipients does not allow group chats.`
+      } else {
+        switch (matchXrpcError(error, chat.bsky.group.createGroup)) {
+          case 'AccountSuspended':
+            errorMessage = l`Suspended accounts cannot participate in a group chat.`
+            break
+          case 'BlockedActor':
+            errorMessage = l`One of the selected recipients has blocked you and cannot be messaged.`
+            break
+          case 'NewAccountCannotCreateGroup':
+            errorMessage = l`You cannot create a group chat yet.`
+            break
+          case 'NotFollowedBySender':
+            errorMessage = l`A selected recipient is not followed by the sender.`
+            break
+          case 'RecipientNotFound':
+            errorMessage = l`Unable to find a selected recipient.`
+            break
+          case 'UserForbidsGroups':
+            errorMessage = l`One of the selected recipients does not allow group chats.`
+            break
+        }
       }
       Toast.show(errorMessage, {
         type: 'error',