fix: Prevent storage listener from clearing auth during login

The storage event was firing when user was saved to localStorage,
causing loadStoredUser() to run and clear the auth state.

Added isLoginInProgress guard to skip storage events during login.

frontend/src/app/core/services/auth.service.ts

@@ -68,6 +68,9 @@ export class AuthService implements OnDestroy {
   // Track storage listener for cleanup
   private storageListener: ((event: StorageEvent) => void) | null = null;
 
+  // Guard to prevent storage listener from interfering during login
+  private isLoginInProgress = false;
+
   constructor() {
     this.loadStoredUser();
     this.setupStorageListener();
@@ -122,6 +125,12 @@ export class AuthService implements OnDestroy {
   private setupStorageListener(): void {
     if (typeof window !== 'undefined') {
       this.storageListener = (event: StorageEvent) => {
+        // Skip if login is in progress to avoid race conditions
+        if (this.isLoginInProgress) {
+          console.log('[AUTH DEBUG] Skipping storage event during login');
+          return;
+        }
+
         this.ngZone.run(() => {
           if (event.key === null || event.key?.includes('token') || event.key?.includes('user')) {
             // Storage was cleared or auth-related key changed
@@ -210,6 +219,7 @@ export class AuthService implements OnDestroy {
     }
 
     this._isLoading.set(true);
+    this.isLoginInProgress = true;
 
     try {
       const response = await firstValueFrom(
@@ -266,6 +276,7 @@ export class AuthService implements OnDestroy {
       this.storage.setUser(user);
       this.updateAuthState(user, true);
     } finally {
+      this.isLoginInProgress = false;
       this._isLoading.set(false);
     }
   }