fix: unblock hung Log Out and Mingo archive TypeError

src/app/(app)/mingo/hooks/use-mingo-dialog-actions.ts

@@ -29,14 +29,22 @@ interface FetchArchivedResult {
 }
 
 async function runDialogMutation(query: string, variables: Record<string, unknown>, key: string): Promise<void> {
-  const response = await apiClient.post<{ data: Record<string, DialogMutationPayload> }>('/chat/graphql', {
+  const response = await apiClient.post<{
+    data: Record<string, DialogMutationPayload> | null;
+    errors?: { message: string }[];
+  }>('/chat/graphql', {
     query,
     variables,
   });
   if (!response.ok || !response.data) {
     throw new Error(response.error || 'Request failed');
   }
-  const payload = response.data.data[key];
+  // A GraphQL-level failure returns HTTP 200 with `data: null` and an `errors`
+  // array. Surface the server's message instead of dereferencing null `data`.
+  if (response.data.errors?.length) {
+    throw new Error(response.data.errors[0].message);
+  }
+  const payload = response.data.data?.[key];
   if (payload?.userErrors?.length) {
     throw new Error(payload.userErrors[0].message);
   }
@@ -118,7 +126,7 @@ export function useMingoDialogActions() {
   const fetchArchivedDialogs = useCallback(
     async (params: FetchArchivedParams): Promise<FetchArchivedResult> => {
       const runFetch = async (): Promise<FetchArchivedResult> => {
-        const response = await apiClient.post<DialogsResponse>('/chat/graphql', {
+        const response = await apiClient.post<DialogsResponse & { errors?: { message: string }[] }>('/chat/graphql', {
           query: GET_MINGO_DIALOGS_QUERY,
           variables: {
             filter: { agentTypes: ['ADMIN'], statuses: ['ARCHIVED'] },
@@ -129,6 +137,12 @@ export function useMingoDialogActions() {
         if (!response.ok || !response.data) {
           throw new Error(response.error || 'Failed to fetch archived chats');
         }
+        // A GraphQL-level failure returns HTTP 200 with `data: null` and an
+        // `errors` array. Surface the server's message instead of dereferencing
+        // null `data`.
+        if (response.data.errors?.length) {
+          throw new Error(response.data.errors[0].message);
+        }
         const { edges, pageInfo } = response.data.data.dialogs;
         return {
           dialogs: edges.map(edge => ({

src/lib/auth-api-client.ts

@@ -39,6 +39,9 @@ function getDomainSuffix(): string {
 
 export const SAAS_DOMAIN_SUFFIX = getDomainSuffix();
 
+/** Upper bound on the server-side logout call before sign-out proceeds anyway. */
+const LOGOUT_TIMEOUT_MS = 5000;
+
 export interface AuthApiResponse<T = any> {
   data?: T;
   error?: string;
@@ -350,16 +353,24 @@ class AuthApiClient {
       }
     }
 
+    // Bound the server call: a hung request must not block the caller, which
+    // waits on this before it clears local state and redirects. On timeout the
+    // abort rejects the fetch, this returns false, and sign-out still finishes.
+    const controller = new AbortController();
+    const timeout = setTimeout(() => controller.abort(), LOGOUT_TIMEOUT_MS);
     try {
       await fetch(logoutUrl, {
         method: 'GET',
         credentials: 'include',
         redirect: 'manual',
         headers,
+        signal: controller.signal,
       });
       return true;
     } catch {
       return false;
+    } finally {
+      clearTimeout(timeout);
     }
   }
 }