bugfix: logout behaviour fixed.

frontend/src/lib/hooks/useAuth.tsx

@@ -181,11 +181,22 @@ export function AuthProvider({ children }: { children: React.ReactNode }) {
   }, [router]);
 
   const logout = useCallback(async () => {
-    localStorage.clear();
-    setUser(null);
-    setOrganizations([]);
-    setCurrentOrganization(null);
-    router.push('/');
+    try {
+      // Important: clear auth cookies/session on the server first,
+      // otherwise middleware may still treat the user as authenticated.
+      await authApi.logout();
+    } catch (err) {
+      console.error('Logout API failed:', err);
+    } finally {
+      localStorage.clear();
+      setUser(null);
+      setOrganizations([]);
+      setCurrentOrganization(null);
+      setError(null);
+      setIsAuthReady(true);
+      router.replace('/');
+      router.refresh();
+    }
   }, [router]);
 
   const selectOrganization = useCallback(async (orgId: string) => {