fix(web): stop invite auto-join retry spam on failures

web/src/app/App.tsx

@@ -6,6 +6,7 @@ import { AuthPage } from "../pages/AuthPage";
 import { ChatsPage } from "../pages/ChatsPage";
 import { useAuthStore } from "../store/authStore";
 import { useChatStore } from "../store/chatStore";
+import { useUiStore } from "../store/uiStore";
 import { applyAppearancePreferences, getAppPreferences } from "../utils/preferences";
 
 const PENDING_INVITE_TOKEN_KEY = "bm_pending_invite_token";
@@ -19,6 +20,7 @@ export function App() {
   const logout = useAuthStore((s) => s.logout);
   const loadChats = useChatStore((s) => s.loadChats);
   const setActiveChatId = useChatStore((s) => s.setActiveChatId);
+  const showToast = useUiStore((s) => s.showToast);
   const [joiningInvite, setJoiningInvite] = useState(false);
 
   useEffect(() => {
@@ -79,12 +81,15 @@ export function App() {
         const chat = await joinByInvite(token);
         await loadChats();
         setActiveChatId(chat.id);
-        window.localStorage.removeItem(PENDING_INVITE_TOKEN_KEY);
+        showToast("Joined by invite");
+      } catch (error) {
+        showToast(inviteJoinErrorMessage(error));
       } finally {
+        window.localStorage.removeItem(PENDING_INVITE_TOKEN_KEY);
         setJoiningInvite(false);
       }
     })();
-  }, [accessToken, me, joiningInvite, loadChats, setActiveChatId]);
+  }, [accessToken, me, joiningInvite, loadChats, setActiveChatId, showToast]);
 
   if (!accessToken || !me) {
     return <AuthPage />;
@@ -120,3 +125,28 @@ function extractEmailVerificationTokenFromLocation(): string | null {
   }
   return url.searchParams.get("token")?.trim() || null;
 }
+
+function inviteJoinErrorMessage(error: unknown): string {
+  const status = getHttpStatusCode(error);
+  if (status === 404) {
+    return "Invite link not found or expired.";
+  }
+  if (status === 403) {
+    return "You are not allowed to join by this invite.";
+  }
+  if (status === 409) {
+    return "You are already a member of this chat.";
+  }
+  return "Failed to join by invite.";
+}
+
+function getHttpStatusCode(error: unknown): number | null {
+  if (!error || typeof error !== "object") {
+    return null;
+  }
+  const maybeResponse = (error as { response?: { status?: unknown } }).response;
+  if (!maybeResponse || typeof maybeResponse.status !== "number") {
+    return null;
+  }
+  return maybeResponse.status;
+}