speechSynthesis is silently muted on iOS Safari and Chrome Android after
the audio session ends (onended), so chapter announcements never played.
Fix:
- Add GET /api/tts-announce backend endpoint: streams a short TTS clip
for arbitrary text without MinIO caching (backend/internal/backend/)
- Add GET /api/announce SvelteKit proxy route (no paywall)
- Add announceNavigatePending/announcePendingSlug/announcePendingChapter
to AudioStore
- Rewrite onended announce branch: sets audioStore.audioUrl to the
announcement clip URL so the persistent <audio> element plays it;
the next onended detects announceNavigatePending and navigates
- 10s safety timeout in case the clip fails to load/end
85492fae73