Reader: note that audio is BSB-only for licensed translations

Co-Authored-By: Claude Sonnet 5.5 <noreply@anthropic.com>

src/pages/ReaderPage.jsx

@@ -562,7 +562,9 @@ export default function ReaderPage() {
             subtitle={
               readerAudioState.status === 'error'
                 ? "Couldn't load audio for this chapter/narrator."
-                : `Audio follows ${readerBook?.name} ${readerChapter} as you browse.`
+                : readerTranslation !== 'BSB'
+                  ? `Audio is BSB only — no ${readerTranslation} audio is available, so it won't match the ${readerTranslation} text on screen.`
+                  : `Audio follows ${readerBook?.name} ${readerChapter} as you browse.`
             }
             status={readerAudioState.status}
             currentTime={audioProgress.currentTime}