feat(albums): add multi-select to Albums, New Releases, and Random Albums

Select multiple albums to add them to the offline cache or download
each as a separate ZIP. Action buttons appear inline in the topbar
when at least one album is selected; title shows selection count.
AlbumCard gains selectionMode/selected/onToggleSelect props with a
checkmark overlay and selected outline.

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

src/locales/de.ts

@@ -244,6 +244,17 @@ export const deTranslation = {
     yearTo: 'Bis',
     yearFilterClear: 'Jahresfilter zurücksetzen',
     yearFilterLabel: 'Jahr',
+    select: 'Mehrfachauswahl',
+    startSelect: 'Mehrfachauswahl aktivieren',
+    cancelSelect: 'Abbrechen',
+    selectionCount: '{{count}} ausgewählt',
+    downloadZips: 'ZIPs herunterladen',
+    addOffline: 'Offline hinzufügen',
+    downloadingZip: 'Lade {{current}}/{{total}} herunter: {{name}}',
+    downloadZipDone: '{{count}} ZIP(s) heruntergeladen',
+    downloadZipFailed: 'Download fehlgeschlagen: {{name}}',
+    offlineQueuing: '{{count}} Album(s) für Offline einreihen…',
+    offlineFailed: '{{name}} konnte nicht offline hinzugefügt werden',
   },
   artists: {
     title: 'Künstler',

src/locales/en.ts

@@ -245,6 +245,17 @@ export const enTranslation = {
     yearTo: 'To',
     yearFilterClear: 'Clear year filter',
     yearFilterLabel: 'Year',
+    select: 'Multi-select',
+    startSelect: 'Enable multi-select',
+    cancelSelect: 'Cancel',
+    selectionCount: '{{count}} selected',
+    downloadZips: 'Download ZIPs',
+    addOffline: 'Add Offline',
+    downloadingZip: 'Downloading {{current}}/{{total}}: {{name}}',
+    downloadZipDone: '{{count}} ZIP(s) downloaded',
+    downloadZipFailed: 'Failed to download {{name}}',
+    offlineQueuing: 'Queuing {{count}} album(s) for offline…',
+    offlineFailed: 'Failed to add {{name}} offline',
   },
   artists: {
     title: 'Artists',

src/locales/fr.ts

@@ -244,6 +244,17 @@ export const frTranslation = {
     yearTo: 'À',
     yearFilterClear: 'Effacer le filtre année',
     yearFilterLabel: 'Année',
+    select: 'Multi-select',
+    startSelect: 'Enable multi-select',
+    cancelSelect: 'Cancel',
+    selectionCount: '{{count}} selected',
+    downloadZips: 'Download ZIPs',
+    addOffline: 'Add Offline',
+    downloadingZip: 'Downloading {{current}}/{{total}}: {{name}}',
+    downloadZipDone: '{{count}} ZIP(s) downloaded',
+    downloadZipFailed: 'Failed to download {{name}}',
+    offlineQueuing: 'Queuing {{count}} album(s) for offline…',
+    offlineFailed: 'Failed to add {{name}} offline',
   },
   artists: {
     title: 'Artistes',

src/locales/nb.ts

@@ -243,7 +243,18 @@ export const nbTranslation = {
 	yearFrom: 'Fra',
     yearTo: 'Til',
     yearFilterClear: 'Tøm år filteret',
-    yearFilterLabel: 'År',				 							
+    yearFilterLabel: 'År',
+    select: 'Multi-select',
+    startSelect: 'Enable multi-select',
+    cancelSelect: 'Cancel',
+    selectionCount: '{{count}} selected',
+    downloadZips: 'Download ZIPs',
+    addOffline: 'Add Offline',
+    downloadingZip: 'Downloading {{current}}/{{total}}: {{name}}',
+    downloadZipDone: '{{count}} ZIP(s) downloaded',
+    downloadZipFailed: 'Failed to download {{name}}',
+    offlineQueuing: 'Queuing {{count}} album(s) for offline…',
+    offlineFailed: 'Failed to add {{name}} offline',
   },
   artists: {
     title: 'Artister',

src/locales/nl.ts

@@ -244,6 +244,17 @@ export const nlTranslation = {
     yearTo: 'Tot',
     yearFilterClear: 'Jaarfilter wissen',
     yearFilterLabel: 'Jaar',
+    select: 'Multi-select',
+    startSelect: 'Enable multi-select',
+    cancelSelect: 'Cancel',
+    selectionCount: '{{count}} selected',
+    downloadZips: 'Download ZIPs',
+    addOffline: 'Add Offline',
+    downloadingZip: 'Downloading {{current}}/{{total}}: {{name}}',
+    downloadZipDone: '{{count}} ZIP(s) downloaded',
+    downloadZipFailed: 'Failed to download {{name}}',
+    offlineQueuing: 'Queuing {{count}} album(s) for offline…',
+    offlineFailed: 'Failed to add {{name}} offline',
   },
   artists: {
     title: 'Artiesten',

src/locales/ru.ts

@@ -253,6 +253,17 @@ export const ruTranslation = {
     yearTo: 'По',
     yearFilterClear: 'Сбросить год',
     yearFilterLabel: 'Год',
+    select: 'Multi-select',
+    startSelect: 'Enable multi-select',
+    cancelSelect: 'Cancel',
+    selectionCount: '{{count}} selected',
+    downloadZips: 'Download ZIPs',
+    addOffline: 'Add Offline',
+    downloadingZip: 'Downloading {{current}}/{{total}}: {{name}}',
+    downloadZipDone: '{{count}} ZIP(s) downloaded',
+    downloadZipFailed: 'Failed to download {{name}}',
+    offlineQueuing: 'Queuing {{count}} album(s) for offline…',
+    offlineFailed: 'Failed to add {{name}} offline',
   },
   artists: {
     title: 'Исполнители',

src/locales/zh.ts

@@ -244,6 +244,17 @@ export const zhTranslation = {
     yearTo: '到',
     yearFilterClear: '清除年份筛选',
     yearFilterLabel: '年份',
+    select: 'Multi-select',
+    startSelect: 'Enable multi-select',
+    cancelSelect: 'Cancel',
+    selectionCount: '{{count}} selected',
+    downloadZips: 'Download ZIPs',
+    addOffline: 'Add Offline',
+    downloadingZip: 'Downloading {{current}}/{{total}}: {{name}}',
+    downloadZipDone: '{{count}} ZIP(s) downloaded',
+    downloadZipFailed: 'Failed to download {{name}}',
+    offlineQueuing: 'Queuing {{count}} album(s) for offline…',
+    offlineFailed: 'Failed to add {{name}} offline',
   },
   artists: {
     title: '艺术家',