Fix: Clear auth state when no user data is returned

Co-authored-by: tumurbarsnarantuya <tumurbarsnarantuya@gmail.com>

apps/portal/src/features/auth/services/auth.store.ts

@@ -343,7 +343,15 @@ export const useAuthStore = create<AuthStoreState>()(
           if (user) {
             set({ user, isAuthenticated: true, loading: false, error: null, hasCheckedAuth: true });
           } else {
-            set({ loading: false, hasCheckedAuth: true });
+            // No user data returned, clear auth state
+            set({
+              user: null,
+              tokens: null,
+              isAuthenticated: false,
+              loading: false,
+              error: null,
+              hasCheckedAuth: true,
+            });
           }
         } catch (error) {
           // Token is invalid, clear auth state