senke 66de8d6638 feat(v0.12.5): PWA enhancements — offline audio, responsive hooks, icons ...

- Service Worker: audio caching strategy for offline playback (cache-first)
- Service Worker: CACHE_AUDIO message for explicit track caching
- useMediaQuery hook with useIsMobile/useIsTablet/useIsDesktop helpers
- PWAUpdateBanner and OfflineBanner components (previously stubs)
- Missing notification icons: badge-72x72, checkmark, xmark

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

2026-03-11 10:09:24 +01:00

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