fix(pr168): title→data-tooltip, i18n playlist toggle, cold-start playlist fetch

- Replace title= with data-tooltip on sidebar playlist expand button (CLAUDE.md)
- Replace hardcoded Spanish aria-label strings with i18n keys (sidebar.expandPlaylists / collapsePlaylists) across all 8 locales
- AddToPlaylistSubmenu now fetches playlists on first open if store is empty (regression fix)

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

src/locales/de.ts

@@ -26,6 +26,8 @@ export const deTranslation = {
     folderBrowser: 'Ordner-Browser',
     libraryScope: 'Bibliotheksumfang',
     allLibraries: 'Alle Bibliotheken',
+    expandPlaylists: 'Playlists ausklappen',
+    collapsePlaylists: 'Playlists einklappen',
   },
   home: {
     hero: 'Featured',

src/locales/en.ts

@@ -27,6 +27,8 @@ export const enTranslation = {
     folderBrowser: 'Folder Browser',
     libraryScope: 'Library scope',
     allLibraries: 'All libraries',
+    expandPlaylists: 'Expand playlists',
+    collapsePlaylists: 'Collapse playlists',
   },
   home: {
     hero: 'Featured',

src/locales/es.ts

@@ -27,6 +27,8 @@ export const esTranslation = {
     folderBrowser: 'Explorar Carpetas',
     libraryScope: 'Ámbito de biblioteca',
     allLibraries: 'Todas las bibliotecas',
+    expandPlaylists: 'Expandir listas',
+    collapsePlaylists: 'Colapsar listas',
   },
   home: {
     hero: 'Destacado',

src/locales/fr.ts

@@ -26,6 +26,8 @@ export const frTranslation = {
     folderBrowser: 'Explorateur de dossiers',
     libraryScope: 'Portée de la bibliothèque',
     allLibraries: 'Toutes les bibliothèques',
+    expandPlaylists: 'Développer les playlists',
+    collapsePlaylists: 'Réduire les playlists',
   },
   home: {
     hero: 'En vedette',

src/locales/nb.ts

@@ -26,6 +26,8 @@ export const nbTranslation = {
     folderBrowser: 'Mappeleser',
     libraryScope: 'Biblioteksomfang',
     allLibraries: 'Alle biblioteker',
+    expandPlaylists: 'Utvid spillelister',
+    collapsePlaylists: 'Skjul spillelister',
   },
   home: {
     hero: 'Utvalgt',

src/locales/nl.ts

@@ -26,6 +26,8 @@ export const nlTranslation = {
     folderBrowser: 'Mappenverkenner',
     libraryScope: 'Bibliotheekbereik',
     allLibraries: 'Alle bibliotheken',
+    expandPlaylists: 'Afspeellijsten uitklappen',
+    collapsePlaylists: 'Afspeellijsten inklappen',
   },
   home: {
     hero: 'Uitgelicht',

src/locales/ru.ts

@@ -27,6 +27,8 @@ export const ruTranslation = {
     folderBrowser: 'Браузер папок',
     libraryScope: 'Область медиатеки',
     allLibraries: 'Все библиотеки',
+    expandPlaylists: 'Развернуть плейлисты',
+    collapsePlaylists: 'Свернуть плейлисты',
   },
   home: {
     hero: 'Подборка',

src/locales/zh.ts

@@ -26,6 +26,8 @@ export const zhTranslation = {
     folderBrowser: '文件夹浏览器',
     libraryScope: '资料库范围',
     allLibraries: '所有资料库',
+    expandPlaylists: '展开播放列表',
+    collapsePlaylists: '收起播放列表',
   },
   home: {
     hero: '精选',