fix(pr-review): address review findings for music folder filter

- Sidebar.tsx: title={} → data-tooltip + data-tooltip-pos="right" on
  scope subtitle (CLAUDE.md rule: never use native title= for tooltips)

- authStore.ts: merge two set() calls in setMusicFolders into one atomic
  update — avoids double render on folder list arrival

- locales (all 7): remove dead libraryScopeHint key (defined but never
  rendered in any component)

- Genres.tsx: remove musicLibraryFilterVersion from effect deps —
  getGenres is intentionally not folder-scoped, re-fetching on filter
  change was a no-op waste

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

src/components/Sidebar.tsx

@@ -159,7 +159,7 @@ export default function Sidebar({
               <div className="nav-library-scope-text">
                 <span className="nav-library-scope-title">{t('sidebar.library')}</span>
                 {selectedFolderName ? (
-                  <span className="nav-library-scope-subtitle" title={selectedFolderName}>
+                  <span className="nav-library-scope-subtitle" data-tooltip={selectedFolderName} data-tooltip-pos="right">
                     {selectedFolderName}
                   </span>
                 ) : null}

src/locales/de.ts

@@ -24,7 +24,6 @@ export const deTranslation = {
     playlists: 'Playlists',
     radio: 'Internetradio',
     libraryScope: 'Bibliotheksumfang',
-    libraryScopeHint: 'Gesamten Server-Katalog oder nur einen Medienordner durchsuchen.',
     allLibraries: 'Alle Bibliotheken',
   },
   home: {

src/locales/en.ts

@@ -24,7 +24,6 @@ export const enTranslation = {
     playlists: 'Playlists',
     radio: 'Internet Radio',
     libraryScope: 'Library scope',
-    libraryScopeHint: 'Browse either your whole server catalog or a single media folder.',
     allLibraries: 'All libraries',
   },
   home: {

src/locales/fr.ts

@@ -24,7 +24,6 @@ export const frTranslation = {
     playlists: 'Playlists',
     radio: 'Radio Internet',
     libraryScope: 'Portée de la bibliothèque',
-    libraryScopeHint: 'Parcourir tout le catalogue du serveur ou un seul dossier média.',
     allLibraries: 'Toutes les bibliothèques',
   },
   home: {

src/locales/nb.ts

@@ -24,7 +24,6 @@ export const nbTranslation = {
     playlists: 'Spillelister',
     radio: 'Internettradio',
     libraryScope: 'Biblioteksomfang',
-    libraryScopeHint: 'Vis hele serverkatalogen eller én mediemappe.',
     allLibraries: 'Alle biblioteker',
   },
   home: {

src/locales/nl.ts

@@ -24,7 +24,6 @@ export const nlTranslation = {
     playlists: 'Playlists',
     radio: 'Internetradio',
     libraryScope: 'Bibliotheekbereik',
-    libraryScopeHint: 'Doorzoek de hele servercatalogus of één mediabibliotheek.',
     allLibraries: 'Alle bibliotheken',
   },
   home: {

src/locales/ru.ts

@@ -25,7 +25,6 @@ export const ruTranslation = {
     playlists: 'Плейлисты',
     radio: 'Онлайн-радио',
     libraryScope: 'Область медиатеки',
-    libraryScopeHint: 'Показывать весь каталог сервера или только одну медиапапку.',
     allLibraries: 'Все библиотеки',
   },
   home: {

src/locales/zh.ts

@@ -24,7 +24,6 @@ export const zhTranslation = {
     playlists: '播放列表',
     radio: '网络电台',
     libraryScope: '资料库范围',
-    libraryScopeHint: '浏览整个服务器目录或仅单个媒体文件夹。',
     allLibraries: '所有资料库',
   },
   home: {

src/pages/Genres.tsx

@@ -49,7 +49,6 @@ const SCROLL_KEY = 'genres-scroll';
 export default function Genres() {
   const { t } = useTranslation();
   const navigate = useNavigate();
-  const musicLibraryFilterVersion = useAuthStore(s => s.musicLibraryFilterVersion);
   const [genres, setGenres] = useState<SubsonicGenre[]>([]);
   const [loading, setLoading] = useState(true);
   const containerRef = useRef<HTMLDivElement>(null);
@@ -61,7 +60,7 @@ export default function Genres() {
         setGenres(sorted);
       })
       .finally(() => setLoading(false));
-  }, [musicLibraryFilterVersion]);
+  }, []); // getGenres is not folder-scoped — no dep on musicLibraryFilterVersion
 
   // Restore scroll position after genres are rendered
   useEffect(() => {

src/store/authStore.ts

@@ -243,15 +243,17 @@ export const useAuthStore = create<AuthState>()(
       setHotCacheDownloadDir: (v) => set({ hotCacheDownloadDir: v }),
 
       setMusicFolders: (folders) => {
-        set({ musicFolders: folders });
         const sid = get().activeServerId;
-        if (!sid) return;
-        const f = get().musicLibraryFilterByServer[sid];
-        if (f && f !== 'all' && !folders.some(x => x.id === f)) {
-          set(s => ({
-            musicLibraryFilterByServer: { ...s.musicLibraryFilterByServer, [sid]: 'all' },
-          }));
-        }
+        set(s => {
+          const f = sid ? s.musicLibraryFilterByServer[sid] : undefined;
+          const invalidFilter = f && f !== 'all' && !folders.some(x => x.id === f);
+          return {
+            musicFolders: folders,
+            ...(sid && invalidFilter
+              ? { musicLibraryFilterByServer: { ...s.musicLibraryFilterByServer, [sid]: 'all' } }
+              : {}),
+          };
+        });
       },
 
       setMusicLibraryFilter: (folderId) => {