refactor(frontend): lint, one session guard, one request helper, one user context

src/hooks/useUserStats.js

@@ -4,10 +4,8 @@ import {statsUrl} from '../utils/stats.js';
 
 /**
  * GET /api/library/stats for the given groups (none = all). stats is null while loading and after an error.
- *
- * @param onUnauthorized called on a 401, e.g. useSessionExpired
  */
-export default function useUserStats(groups, onUnauthorized, enabled = true) {
+export default function useUserStats(groups, enabled = true) {
     const [stats, setStats] = useState(null);
     const [failed, setFailed] = useState(false);
     const key = groups.join(',');
@@ -16,10 +14,7 @@ export default function useUserStats(groups, onUnauthorized, enabled = true) {
         setFailed(false);
         try {
             const response = await apiFetch(statsUrl(key));
-            if (response.status === 401) {
-                onUnauthorized();
-                return;
-            }
+            if (response.status === 401) return;
             if (!response.ok) {
                 setFailed(true);
                 return;
@@ -29,7 +24,7 @@ export default function useUserStats(groups, onUnauthorized, enabled = true) {
             console.error('Stats load error:', err);
             setFailed(true);
         }
-    }, [key, onUnauthorized]);
+    }, [key]);
 
     useEffect(() => {
         if (enabled) load();