feat(auth): tell the user when the session expired

Every 401 from Auth or Core now goes through useSessionExpired: the login page
says the session expired and returns to the last page after login. App no
longer removes a token that only the browser clock calls expired, so a backend
401 is the one signal. A 403 on the profile now shows an error instead.

src/pages/GameLibrary.jsx

@@ -4,6 +4,7 @@ import {useTranslation} from 'react-i18next';
 import useLibrarySync from '../hooks/useLibrarySync.js';
 import SyncStatusBadge from '../components/SyncStatusBadge.jsx';
 import useForceSync from '../hooks/useForceSync.js';
+import useSessionExpired from '../hooks/useSessionExpired.js';
 import {formatPlaytime} from '../utils/games.js';
 import {GAME_STATUSES, libraryQuery, parseStatus} from '../utils/backlog.js';
 import {ArrowUpDown, ChevronLeft, ChevronRight, Clock, Library, RefreshCw, Search, SearchX} from 'lucide-react';
@@ -33,6 +34,7 @@ const SORT_OPTIONS = [
 export default function GameLibrary() {
     const {t} = useTranslation();
     const navigate = useNavigate();
+    const expireSession = useSessionExpired();
     const [searchParams, setSearchParams] = useSearchParams();
 
     const page = Math.max(0, parseInt(searchParams.get('page') ?? '0', 10) || 0);
@@ -68,8 +70,7 @@ export default function GameLibrary() {
             });
 
             if (response.status === 401) {
-                localStorage.removeItem('tbp_jwt');
-                navigate('/login');
+                expireSession();
                 return;
             }
 
@@ -86,7 +87,7 @@ export default function GameLibrary() {
         } finally {
             setIsLoading(false);
         }
-    }, [navigate, page, size, sort, status, q, t]);
+    }, [navigate, expireSession, page, size, sort, status, q, t]);
 
     useEffect(() => {
         load();
@@ -97,6 +98,7 @@ export default function GameLibrary() {
         enabled: true,
         expectInitialSync,
         onComplete: load,
+        onUnauthorized: expireSession,
     });
 
     const updateParams = (next) => {