fix(contacts-ui): show specific add-by-email errors

web/src/components/ChatList.tsx

@@ -1,5 +1,6 @@
 import { useEffect, useRef, useState } from "react";
 import { createPortal } from "react-dom";
+import axios from "axios";
 import { archiveChat, clearChat, createPrivateChat, deleteChat, getChats, getSavedMessagesChat, joinChat, leaveChat, pinChat, unarchiveChat, unpinChat } from "../api/chats";
 import { globalSearch } from "../api/search";
 import type { DiscoverChat, Message, UserSearchItem } from "../chat/types";
@@ -526,8 +527,20 @@ export function ChatList() {
                     await addContactByEmail(email);
                     setContactEmail("");
                     setContacts(await listContacts());
-                  } catch {
-                    setContactEmailError("User with this email not found");
+                    setContactEmailError(null);
+                  } catch (error) {
+                    if (axios.isAxiosError(error)) {
+                      const status = error.response?.status;
+                      if (status === 404) {
+                        setContactEmailError("User with this email not found");
+                        return;
+                      }
+                      if (status === 409) {
+                        setContactEmailError("Cannot add contact while blocked");
+                        return;
+                      }
+                    }
+                    setContactEmailError("Failed to add contact");
                   }
                 }}
                 type="button"