feat: improve offline caching, stale data handling, and sync resilience - #539
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- Add src/lib/watchlist.ts with CacheState type (fresh/stale/unavailable),
STALE_THRESHOLD_MS, loadWatchlistFromStorage, saveWatchlistToStorage,
getCacheState, and isNewerThanLocal helpers
- Update WatchlistContext to expose cacheState and use watchlist lib
- Update NotificationCenterProvider to persist sync timestamps and guard
against stale server responses overwriting newer local mutations
- Add StaleDataBanner to notifications/page.tsx shown when cacheState=stale
- Rewrite sw.js with three-tier caching strategy:
navigation → network-first with offline fallback
API calls → stale-while-revalidate
static → cache-first
- Include PWAHandler in layout.tsx for SW registration
- Upgrade PWAHandler to handle online/offline transitions, emit
RustAcademy.lastOnlineAt/lastOfflineAt timestamps, and relay SW
cache stats via postMessage
- Update offline/page.tsx to show cached data status (last sync
timestamps, stale indicators, API cache entry count)
- Update api.ts with fetchWithCache and getCacheAge helpers
- Add stale data banner to dashboard/page.tsx when cached data is used
Closes BlockDash-Studios#534
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API calls → stale-while-revalidate
static → cache-first
RustAcademy.lastOnlineAt/lastOfflineAt timestamps, and relay SW
cache stats via postMessage
timestamps, stale indicators, API cache entry count)
Closes #534