core, ui: better error on failed channel creation (#6825)

bots/api/COMMANDS.md

@@ -983,6 +983,11 @@ PublicGroupCreated: Public group created.
 - groupLink: [GroupLink](./TYPES.md#grouplink)
 - groupRelays: [[GroupRelay](./TYPES.md#grouprelay)]
 
+PublicGroupCreationFailed: Public group creation failed.
+- type: "publicGroupCreationFailed"
+- user: [User](./TYPES.md#user)
+- addRelayResults: [[AddRelayResult](./TYPES.md#addrelayresult)]
+
 ChatCmdError: Command error (only used in WebSockets API).
 - type: "chatCmdError"
 - chatError: [ChatError](./TYPES.md#chaterror)

bots/api/TYPES.md

@@ -5,6 +5,7 @@ This file is generated automatically.
 - [ACIReaction](#acireaction)
 - [AChat](#achat)
 - [AChatItem](#achatitem)
+- [AddRelayResult](#addrelayresult)
 - [AddressSettings](#addresssettings)
 - [AgentCryptoError](#agentcryptoerror)
 - [AgentErrorType](#agenterrortype)
@@ -220,6 +221,15 @@ This file is generated automatically.
 - chatItem: [ChatItem](#chatitem)
 
 
+---
+
+## AddRelayResult
+
+**Record type**:
+- relay: [UserChatRelay](#userchatrelay)
+- relayError: [ChatError](#chaterror)?
+
+
 ---
 
 ## AddressSettings