JWT enhancements for desktop (#5742)

# Description of Changes

This is temporary solution which will be enhanced in future

---

## Checklist

### General

- [ ] I have read the [Contribution
Guidelines](https://github.com/Stirling-Tools/Stirling-PDF/blob/main/CONTRIBUTING.md)
- [ ] I have read the [Stirling-PDF Developer
Guide](https://github.com/Stirling-Tools/Stirling-PDF/blob/main/devGuide/DeveloperGuide.md)
(if applicable)
- [ ] I have read the [How to add new languages to
Stirling-PDF](https://github.com/Stirling-Tools/Stirling-PDF/blob/main/devGuide/HowToAddNewLanguage.md)
(if applicable)
- [ ] I have performed a self-review of my own code
- [ ] My changes generate no new warnings

### Documentation

- [ ] I have updated relevant docs on [Stirling-PDF's doc
repo](https://github.com/Stirling-Tools/Stirling-Tools.github.io/blob/main/docs/)
(if functionality has heavily changed)
- [ ] I have read the section [Add New Translation
Tags](https://github.com/Stirling-Tools/Stirling-PDF/blob/main/devGuide/HowToAddNewLanguage.md#add-new-translation-tags)
(for new translation tags only)

### Translations (if applicable)

- [ ] I ran
[`scripts/counter_translation.py`](https://github.com/Stirling-Tools/Stirling-PDF/blob/main/docs/counter_translation.md)

### UI Changes (if applicable)

- [ ] Screenshots or videos demonstrating the UI changes are attached
(e.g., as comments or direct attachments in the PR)

### Testing (if applicable)

- [ ] I have tested my changes locally. Refer to the [Testing
Guide](https://github.com/Stirling-Tools/Stirling-PDF/blob/main/devGuide/DeveloperGuide.md#6-testing)
for more details.

frontend/src/desktop/services/apiClientSetup.ts

@@ -16,6 +16,7 @@ let lastBackendToast = 0;
 interface ExtendedRequestConfig extends InternalAxiosRequestConfig {
   operationName?: string;
   skipBackendReadyCheck?: boolean;
+  skipAuthRedirect?: boolean;
   _retry?: boolean;
 }
 
@@ -55,7 +56,10 @@ export function setupApiInterceptors(client: AxiosInstance): void {
           // Self-hosted mode: enable credentials for session management
           extendedConfig.withCredentials = true;
 
+          // If another request is already refreshing, wait before attaching token.
+          await authService.awaitRefreshIfInProgress();
           const token = await authService.getAuthToken();
+
           if (token) {
             extendedConfig.headers.Authorization = `Bearer ${token}`;
           } else {
@@ -104,9 +108,16 @@ export function setupApiInterceptors(client: AxiosInstance): void {
     },
     async (error) => {
       const originalRequest = error.config as ExtendedRequestConfig;
+      const requestUrl = String(originalRequest?.url || '');
+      const isAuthProbeRequest = requestUrl.includes('/api/v1/auth/me');
 
       // Handle 401 Unauthorized - try to refresh token
       if (error.response?.status === 401 && !originalRequest._retry) {
+        // `/auth/me` is used as a probe by session bootstrap; refreshing here can
+        // create recursion (refresh -> save token -> jwt-available -> /auth/me).
+        if (isAuthProbeRequest) {
+          return Promise.reject(error);
+        }
         if (typeof window !== 'undefined') {
           console.warn('[apiClientSetup] 401 on path:', window.location.pathname, 'url:', originalRequest.url);
         }